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Physics Revision Notes:
Electricity

Electrical Components:




Voltmeters and Ammeters:

Voltmeters measure the potential difference across a component in an electrical circuit; this means they
measure the voltage the component uses. Voltmeters therefore need to be placed in parallel. This means
they are not in the same `loop' as the component…

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Changes in Current and Voltage:

Current change with a resistor- If the resistance on a variable resistor is increased, less
electricity will be able to flow, and therefore the current will be lower. The voltage flowing
across a variable resistor, is directly proportional to the current flowing through it.

Current…

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Finding the correct fuse rating-

Current (amps)= Power (watts)/ Voltage (Volts)

Voltage from mains supply is 230 V; the power is on the appliance (will be given in an exam
question); to choose the correct fuse rating, the current in the fuse must be slightly higher than that in the…

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Mains electricity:

Different countries have a different mains voltage; however, the voltage for a domestic house in Britain is
approximately 230V; if the voltage as much higher than this, it can be extremely dangerous if there is a
fault. If the voltage was lower, it would cost more to step…

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