GCSE Separate Science Physics
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| show | It induces a potential difference.
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| What flows then there is a potential difference? | show 🗑
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| show | How fast the magnetic field is changing or moves past the coil
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| What happens to the induced p.d. if the magnetic field is reversed? | show 🗑
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| show | A coil that is rotated in a magnetic field
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| What are the ends of the coil connected to? | show 🗑
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| What touches the slip rings so they are connected to the external circuit? | show 🗑
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| show | Alternating current.
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| If the ring is connected to a commutator, what type of current does it generate? | show 🗑
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| show | Dynamo.
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| show | This is system of wires and cables that bring electricity from the power system to our homes and other buildings.
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| Where is energy lost in the national grid? | show 🗑
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| What happens if the voltage (potential difference ) across the transmission wire is increased? | show 🗑
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| Why do we transmit electricity at low currents? | show 🗑
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| What type of transformer increases the voltage (potential difference) as the electricity leaves the power station? | show 🗑
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| show | 25kW to 400kW
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| What type of transformer reduces the voltage (potential difference before it enters our homes? | show 🗑
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| show | It increases.
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| show | primary and secondary.
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| If the voltage (potential difference ) is to be increased what can you state about the ratio of the coils in the transformer? | show 🗑
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| show | It is a measure of the energy transferred by each coulomb of charge that flows through a wire.
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| show | It measures the number of coulombs per second passing a point in a circuit.
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| What is electrical power? | show 🗑
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| show | Electrical power = current x potential difference
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| What is the equation in symbols? | show 🗑
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| What is the principle of conservation of energy? | show 🗑
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| show | They are the same.
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| show | Vpx Ip = VsxIs
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| What is assumed in the transformer equation? | show 🗑
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| If Ip=2A, Vs=200V and Is=0.1A, what is Vp? | show 🗑
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| show | alternating current
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| show | mains electricity
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| show | direct current
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| show | batteries
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| What is the potential difference of mains electricity in the UK? | show 🗑
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| show | 50Hz
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| show | Cables and transformers
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| show | no
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| show | Increases p.d.
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| What does a step down transformer do? | show 🗑
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| show | reduce current so that less heat is lost in cables, increases efficiency
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