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Electricity
GCSE Physics and combined science
| Question | Answer |
|---|---|
| Draw the circuit symbol for a switch | Draw |
| Draw the circuit symbol for a closed switch | Draw |
| Draw the circuit symbol for a cell | Draw |
| Draw the circuit symbol for a battery | Draw |
| Draw the circuit symbol for a diode | Draw |
| Draw the circuit symbol for a resistor | Draw |
| Draw the circuit symbol for a variable resistor | Draw |
| Draw the circuit symbol for an LED | Draw |
| Draw the circuit symbol for a lamp | Draw |
| Draw the circuit symbol for a fuse | Draw |
| Draw the circuit symbol for a voltmeter | Draw |
| Draw the circuit symbol for an ammeter | Draw |
| Draw the circuit symbol for a thermistor | Draw |
| Draw the circuit symbol for an LDR | Draw |
| State the rule for current in a series circuit | the current is the same at every point in the circuit and in every component |
| State the rule for potential difference in a series circuit | the total potential difference of the power supply is shared between components |
| State the rule for resistance in a series circuit | the more resistors, the greater the resistance. RT=R1+R2 |
| State the rule for current in a parallel circuit | the total current through the whole circuit is the sum of the currents through the separate components |
| State the rule for potential difference in a parallel circuit | the potential difference across each branch in the circuit is the same |
| State the rule for resistance in a parallel circuit | adding more resistors in parallel decreases resistance |
| What colour is the live wire in a three core cable? | brown |
| What colour is the neutral wire in a three core cable? | blue |
| What colour is the earth wire in a three core cable? | green and yellow |
| The brown wire in a plug is the _______ | live |
| The blue wire in a plug is the ________ | neutral |
| The green and yellow wire in a plug is the ________ | earth |
| The potential difference between the live wire and others in the plug is _____ V | 230V |
| Current flows into an appliance through the _______ wire | live |
| Current flows out of an appliance through the ______ wire | neutral |
| The _________ wire is a safety feature of appliances | earth |
| Potential difference between the neutral wires and others in the plug should be ____ V | 0V |
| Electric Current is….? | the flow of electric charge |
| Potential difference between two points in a circuit is….? | the work done when a couloumb of charge passes between the points. |
| In a circuit the potential difference causes …..? | charge to flow |
| Resistance is…? | caused by anything which opposes the flow of electric charge |
| Particles which can be 'charges' in electric circuits are… | electrons or ions |
| What is a series circuit? | A circuit with only one route for charge to flow |
| What is a parallel circuit? | A circuit with more than one route for charge to flow |
| State the equation which links charge flow, current and time | Q=It |
| State the equation which links current, potential difference and resistance | V=IR |
| State the equation which links current, potential difference and power | P=IV |
| State the equation which links current, power and resistance | P=I2R |
| State the equation which links energy transferred, power and time | E=Pt |
| State the equation which links charge flow, energy transferred and potential difference | E=QV |
| What is the unit of charge flow? | Coulomb ( C ) |
| What is the unit of current? | Amps (A) |
| What is the unit for potential difference? | Volts (V) |
| What is the unit for resistance? | Ohms (Ω) |
| What is the unit for power? | Watts (W) |
| Draw the I-V characteristic for a fixed resistor | teacher to draw on board… |
| Draw the I-V characteristic for a filament lamp see | teacher to draw on board… |
| Draw the I-V characteristic for a diode | teacher to draw on board… |
| Describe the I-V characteristic for a fixed resistor | Current and potential difference are directly proportional, resistance is constant |
| Describe the I-V characteristic of a filament lamp | Resistance is not constant, it increases as p.d. increases |
| Explain why resistance increases with increased p.d. in a filament lamp | temperature increases causing ions to vibrate and increasing collisions with electrons flowing through the filament |
| Describe the I-V characteristic of a diode | The current only flows through the diode in one direction, there is a very high resistance in the reverse direction. |
| Current which regularly changes direction is called… | alternating current |
| An example of alternating current is…? | mains electricity |
| Current which flows in one direction is…? | direct current |
| An example of direct current is… | batteries |
| What is the potential difference of mains electricity in the UK? | 230V |
| What is the frequency of the alternating current in UK mains electricity? | 50Hz |
| The national grid consists of…? | Cables and transformers |
| Are power stations par of the national grid? | no |
| What does a step up transformer do? | Increases p.d. |
| What does a step down transformer do? | reduces p.d. to 230 V |
| Why are transformers used? | reduce current so that less heat is lost in cables, increases efficiency |
Created by:
JBearfield
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