GCSE Separate Science Physics
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| show | A positively charged nucleus orbited by negative electrons on shells
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| show | Positive
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| show | Negative
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| show | Positive
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| 5 What is the overall charge of an atom | show 🗑
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| show | To Push the electrons around the circuit
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| 7 What provides the voltage | show 🗑
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| show | Negative terminal to Positive terminal
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| show | Positive terminal to negative terminal
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| 10 What is a series circuit | show 🗑
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| show | A circuit in which the current has more than one path to flow through
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| show | The rate of flow of charge
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| 2. What instrument is used to measure current? | show 🗑
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| show | Ampere or Amps
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| show | Ammeter connected in series with the component
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| show | Potential difference
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| show | To push the electrons around the circuit
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| show | Volts
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| show | Voltmeter
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| show | In parallel across the component
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| show | The rate of flow of charge is current and the current is the same at all points in a series circuit.
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| show | The voltage from the source is shared across the resistors proportionally.
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| show | The rate of flow of charge is current and the sum of the currents going into a junction is equal to the sum of the currents leaving the junction
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| show | Ammeter 2 = 2.5A ,Ammeter 3 = 2.5A
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| show | Current through each lamp is 0.5 A
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| 15. The voltage across the source is 15V and all the resistors have identical resistances, what is the voltage across each resistor? | show 🗑
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| show |
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| show | Coulomb
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| 2.What is the definition of the coulomb | show 🗑
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| 3.What are these charges called in metals | show 🗑
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| 4. What is the charge on an electron | show 🗑
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| show | The rate of flow of charge
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| show | Charge (Q) in Coulomb (C) = Current (I) in amps (A) x time (t) in Seconds (S)
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| 7 Make each variable of the equation in number 6 the subject of the formula. | show 🗑
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| show | 5 minutes = 5x60 =300 seconds ,Q = I x t, Q = 2A x 300s , Q = 600C
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| 9. A heater uses 5A of current and has 1200C flowing. For how long was the heater on? | show 🗑
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| 10. A charge of 36,000C flows for half an hour through a lamp, what current flowed through the lamp? | show 🗑
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| 11. State the equation with units of each variable linking charge, energy and Volt? | show 🗑
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| show | 1V = 1J/s
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| 13. 900 J of energy was supplied to a lamp as 270C of charge flowed through it, what is the voltage across the lamp? | show 🗑
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| 14. Calculate the energy used up when 25C passes through a wire with a voltage of 1.2V across it. | show 🗑
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| show | E = Q x V, Q = E/V, Q = 45J/ 1.5V, Q = 30C
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| show | Resistance decreases with light intensity
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| show | Resistance increases with a fall in temperature
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| show | Find the reciprocal of the slope of the graph or points on the graph.
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| show | The resistance remains the same
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| show | High resistance in one direction and a low resistance in the other direction. So current can only flow in one direction.
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| 15.Describe the resistance of the filament lamp | show 🗑
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| 1 Fill in the gaps When a -------------- passes through a resistor, energy is --------------------- because electrical ---------- is done against the ----------------------, during which the resistor becomes ---------------. | show 🗑
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| 2 State two instances where the heating effect is useful and two instance where it is not useful | show 🗑
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| show | Spread out
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| show | The surroundings warms up
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| show | As the electrons flow down the wire, they collide with the ions and transfer energy so the ions vibrate more vigorously. So it becomes more difficult for the electrons to flow so the resistance to increases. The excess heat is dissipated to the environme
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| show | 1 Use wires with low resistance eg Copper
2 Use thick wires as they have lower resistance
3 Cool the metal to reduce the vibrations in the lattice.
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| 7 State the worded equation for electrical energy transferred | show 🗑
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| 8 State the equation for electrical energy transferred in symbols | show 🗑
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| show | E = I x V x t E = 3A x 230V x120s, E = 82,800J
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| show | E = I x V x t I = E/ V x t I = 207,000J/230V x30x60s I = 0.5A
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| show | The rate at which energy is transfered
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| 2State the unit of power and its symbol | show 🗑
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| show | Power= energy divide by time, P =E/t
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| show | Power = current multiplied by voltage P = I x V
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| 5 state the worded and symbol equation relating power, current and resistance | show 🗑
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| show | P =E/t 2 minutes = 120s, 9kJ = 9,000J, P = 9000J/ 120s P = 75W
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| show | P = I x V, P = 3.5A x 60V, P = 210W
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| 8 What is the power transferred when 6A of current flows through a radio with a resistance of 5Ω | show 🗑
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| show | Proportional current, and voltage
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| show | 1 Divide the energy transferred by the time it took 2 multiply the current through the device by the voltage across the device.3 Multiply the current squared through the device by the resistance of the device
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| show | The live wire connects the appliance to the generator at the power station.
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| 2 The Earth wire | show 🗑
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| show | Provides a return path to the power station
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| 4 What is the voltage on the earth wire? | show 🗑
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| 5 What is the voltage on the Live wire? | show 🗑
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| 6 What is the voltage on the neutral wire? | show 🗑
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| 7 Fuses are marked with the current it can carry, what are the usual current values | show 🗑
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| show | Live wire
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| 9. Which wire normally have green and yellow colours | show 🗑
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| show | Neutral wire
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| show | A current passes through the wire the wire gets hot and if the current exceeds a curtain value the fuse wire melts and the circuit is broken which prevents current from flowing.
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| show | If you touch the metal parts, you will have a dangerous shock as the current flows through you to the ground that is 0V and the live wire is 230V. Causing a potential difference of 230V through your body.
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| show | They detect a change in current and safely switch off the power supply.
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| 15 Two advantages of circuit breakers over fuse. | show 🗑
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| State the rule for current in a series circuit | show 🗑
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| show | the total potential difference of the power supply is shared between components
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| show | the more resistors, the greater the resistance. RT=R1+R2
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| show | the total current through the whole circuit is the sum of the currents through the separate components
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| State the rule for potential difference in a parallel circuit the potential difference across each branch in the circuit is the same | show 🗑
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| show | adding more resistors in parallel decreases resistance
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| What colour is the live wire in a three core cable? | show 🗑
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| What colour is the neutral wire in a three core cable? | show 🗑
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| show | green and yellow
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| show | live
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| The blue wire in a plug is the ________ | show 🗑
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| show | earth
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| show | 230V
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| Current flows into an appliance through the _______ wire | show 🗑
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| Current flows out of an appliance through the ______ wire | show 🗑
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| show | earth
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| show | 0V
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| show | the flow of electric charge
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| Potential difference between two points in a circuit is….? | show 🗑
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| In a circuit the potential difference causes …..? | show 🗑
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| show | caused by anything which opposes the flow of electric charge
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| Particles which can be 'charges' in electric circuits are… | show 🗑
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| show | A circuit with only one route for charge to flow
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| What is a parallel circuit? | show 🗑
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| State the equation which links charge flow, current and time | show 🗑
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| State the equation which links current, potential difference and resistance | show 🗑
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| State the equation which links current, potential difference and power | show 🗑
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| State the equation which links current, power and resistance | show 🗑
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| show | E=Pt
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| show | E=QV
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| What is the unit of charge flow? | show 🗑
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| show | Amps (A)
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| What is the unit for potential difference? | show 🗑
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| What is the unit for resistance? | show 🗑
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| What is the unit for power? | show 🗑
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| show | teacher to draw on board…
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| show | teacher to draw on board…
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| show | teacher to draw on board…
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| Describe the I-V characteristic for a fixed resistor | show 🗑
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| Describe the I-V characteristic of a filament lamp | show 🗑
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| Explain why resistance increases with increased p.d. in a filament lamp | show 🗑
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| Describe the I-V characteristic of a diode | show 🗑
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