| Quiz | Electricity |
|---|---|
| Name | |
| Result | PASSED |
| Score | 57 / 68 (83.8%) |
| Passing score | 54.4 |
| Quiz took | 2 h 6 min 12 sec |
| Quiz finished at | 2025-04-08 14:52:10 |
Resistor A has a current of 4 A flowing through it when the potential difference across it is 20 V. What is the size of its resistance?
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Which of these is not a formula for electrical power?
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____________ can be used to increase the potential difference.
Transformers consist of two coils and
Transformers only work with
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A charge of 12 C transfers 360 J of electrical energy through a resistor. Calculate the potential difference across the resistor.
If a material gains electrons it becomes
Calculate the charge that flows in three hours when there is a current of 0.25 A in a circuit.
When conducting experiments, it is important to switch the circuit off between taking readings, because
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A current of 2 A flows for 2 minutes. Calculate how much charge flows in this time.
An electric oven is connected to the mains at a potential difference of 230 V and takes a current of 40 A. Calculate the power rating of the oven
A charge of 4800 C flows through a filament lamp for 4 minutes. Calculate the average current in the filament lamp
Static electricity is caused by transfer of
Name this electrical circuit symbol
Name this electrical circuit symbol
Voltmeters must always be connected
Calculate the power rating of a microwave that transfers 30 kJ of electrical energy in 60 s.
A positively charged duster and a positively charged rod will
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A device has a power rating of 3400 W and a resistance of 120 ohms. Calculate the size of the current flowing in the device.
____________ can be used to decrease the potential difference.
This is the I-V graph for a
A charge of 20 C passes through a motor. The potential difference across the motor is 9 V. Calculate how much energy is transferred.
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A battery is
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In a British plug, the blue wire is
Calculate the efficiency of an electric desk fan which has a total power input of 80 W and a useful power output of 60 W.
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In order to protect against humans being electrocuted, appliances are often
The resistance of a LDR is larger in the
Power is measured in
In a British plug, the yellow/ green wire is
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Calculate the charge that flows 5 minutes when there is a current of 5mA in a circuit.
In a British plug, the brown wire is
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Which of the following can be used to change the size of the potential difference?
A current of 5 A passes through a wire of resistance 40 ohms. Work out how much energy is transferred each second.
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This is the I-V graph for a
There is a 230 V potential difference across the primary coil of a transformer and a 9 A current through this primary coil. There is a 12 A current through the secondary coil of the transformer. Calculate the potential difference across the secondary coil of the transformer.
Just before entering our homes, the electricity will go through a
An electric current in a wire is a flow of
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Name this electrical circuit symbol
A current of 2 A flows through a bulb for 2 minutes. The potential difference across the bulb is 6 V. Work out how much energy is transferred.
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At home, your sockets provide
In order to minimise energy losses as heat, the national grid transports electrical energy at
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The brightness of 2 bulbs in the series circuit will be much ______ than the brightness of the bulbs in the parallel circuit.
A 230 V potential difference is input into a transformer. The transformer has 50 turns on the primary coil and 120 turns on the secondary coil. Calculate the output potential difference.
This is the I-V graph for a
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The national grid uses step-up transformers to transmit power at __________ , as this wastes less energy as heat and is a more efficient way to transmit power.
Electrons can be transferred from one object to another by
The resistance of a thermistor depends on its temperature. The higher the temperature,
If a material loses electrons it becomes
A positively charged duster and a negatively charged rod will
Mains electricity in Britain is
LDR stands or
Name this electrical circuit symbol
Name this electrical circuit symbol