IGCSE Physics section B: Electricity

?
Name hazards that may lead to fatal electric shocks
frayed cables, long cables, damage to plugs or any insulating casing, water, conductive objects.
1 of 17
Why are all mains wiring double insulated
so that non of the wires are allowed to touch and also prevents anyone from touching the live wire
2 of 17
why are fuses fitted in plugs
so that only a certain amount of current can pass.
3 of 17
why are circuit breakers used more often than fuses
because they do not have to be replaced when they break the circuit
4 of 17
what is the power formula
power= current x voltage, p=iv
5 of 17
what is the energy formula
energy=power x time or energy= current x voltage x time
6 of 17
What is current
it is the rate of flow of charge round the circuit
7 of 17
what is voltage
it is the driving force that pushes the current round
8 of 17
what is a resistance
anything in a circuit that slows the flow down
9 of 17
what happens if you increase the voltage in a circuit
more current will flow
10 of 17
what happens if you increase the resistance in a circuit
less current will flow
11 of 17
what does an ammeter measure
current
12 of 17
what does a voltmeter measure
voltage
13 of 17
where must the ammeter be placed
in series
14 of 17
where must the voltmeter be placed
in parallel around the component under test
15 of 17
what is the voltage formula
voltage=current x resistance, v=IR
16 of 17
what is the charge formula
charge=current x time, Q=It
17 of 17

Other cards in this set

Card 2

Front

Why are all mains wiring double insulated

Back

so that non of the wires are allowed to touch and also prevents anyone from touching the live wire

Card 3

Front

why are fuses fitted in plugs

Card 4

Front

why are circuit breakers used more often than fuses

Card 5

Front

what is the power formula