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WorksheetsEdexcel IGCSE - Electricity
Total questions: 48
Worksheet time: 24mins
What is the unit for potential difference?
V
A
W
J
What is the symbol for current?
P
I
V
R
What is the unit for current?
C
Ω
J
A
What is the equation for Ohm's law?
P = IV
I = VR
Q = IT
V = IR
What is the resistance of a filament bulb with 3V and 2A?
6
1.5 Ω
5 Ω
0.67 Ω
What variable symbol has the units 'W'?
Q
I
E
P
Assuming all bulbs are identical, what would the potential difference be if each cell provides 3V?
Series = 3V, 3V
Parallel = 3V, 3V
Series = 6V, 6V
Parallel = 3V, 3V
Series = 3V, 3V
Parallel = 6V, 6V
Series = 6V, 6V
Parallel = 6V, 6V
Current is ...
force of electricity
the amount of energy in the circuit
the total charge
the rate of flow of charge
Pick the true equation
I = Qt
Q = It
t = IQ
I = t/Q
Pick the true equation
E = QV
Q = EV
E = V/Q
E = Q/V
Define 'power'
The amount of energy supplied
The voltage per unit time
The current per unit time
The energy per unit time
Why do we not need an earth wire for a plastic cased hairdryer?
Because it blows air
Because it doesn't need much energy
Because the plastic is an insulator
Because the plastic is a conductor
Name the brown wire
Live wire
Neutral wire
Earth wire
Current wire
What fuse rating would you want in a 5.5A circuit?
3A
5A
7A
10A
Why are circuit breakers better than fuses?
They can be reset and reused
They are cheaper
They only melt once
They are smaller
For these graphs a high resistance is shown by...
a shallow gradient
a steep gradient
an increasing gradient
a decreasing gradient
"Voltage is directly proportional to current" is true for what type of component?
A filament bulb
A diode
A thermistor
An ohmic conductor
What happens to resistance in a circuit if the temperature is increased?
It increases
It decreases
It stays the same
It fluctuates
How is energy provided to a component in a circuit?
Through magnetic force
Electrons bumping into the ions in the component
By protons repelling each other
By radio waves
Using P = IV, calculate the current provided by a 10W power supply and a potential difference of 4V
2.5A
40A
0.4A
6A
Calculate the power supplied by a 4A current with a 2V cell.
2W
2J
8W
8J
Pick the unit that does not exist!
kW
s
C
j
E = IVt, calculate the energy supplied by 3A and 5V over 2 minutes
30W
30J
1800W
1800J
What type of power supply is a battery?
AC
DC
Pulsating current
Variable current
What type of current do we use in the mains system
AC
DC
Pulsating current
Variable current
What is the voltage in the mains power supply?
120V
200V
230V
280V
What does a step up transformer do?
Increase voltage and decrease current
Decrease voltage and increase current
Increase voltage and increase current
Decrease voltage and decrease current
If 3 bulbs are in parallel, what happens if one of them breaks?
They all go out
The other two remain exactly the same
The other two will get slightly brighter
The other two will get slightly dimmer
The voltage is the same in each component when they are...
in series
in parallel
What happens to the total resistance of a circuit if resistors are put in parallel instead of in series?
It doesn't change
It increases dramatically
It slightly increases
It decreases
If you increase the resistance of a circuit, what happens to the current?
It decreases
It increases
It remains unchanged until you change the voltage
It stays the same
The charged particles that can move out of an atom are...
protons
neutrons
positrons
electrons
Current is the rate of flow of...
electrons
protons
charged particles
electricity
When two positively charged objects are near each other they will...
attract
repel
oscillate
do nothing
When a positively charged object is placed next to a neutral one they will...
attract
repel
oscillate
do nothing
An LDR is a...
light diode resistor
light dependent reactor
light dependent resistor
light deflecting resistor
A thermistor is a component which changes resistance depending on...
light
current
humidity
temperature
What would happen to an LED in a low frequency AC circuit?
It would not work
It would break
It would flash
It would glow brighter some of the time
To use an ammeter and a voltmeter they must be...
ammeter and voltmeter in series with component
ammeter in series and voltmeter in parallel with component
ammeter in parallel and voltmeter in series with component
ammeter and voltmeter in parallel with component
Ammeter resistance is
Effectively infinite
Negligible
dependent on temperature
dependent on current
The resistance of a voltmeter is...
effectively infinite
negligible
dependent on light intensity
variable with the buttons on the back
Calculate the charge supplied by a 4A current in 0.5 minutes
2C
8C
0.125C
120C
What flows through the metal wires in a live circuit?
protons
neutrons
electrons
ions
Assuming the bulbs are identical, what would the current be in each bulb if 8A is leaving the cell?
8A, 8A
4A, 4A
8A, 0A
6A, 2A
Why is static electricity dangerous when refuelling planes?
Because the person refuelling might get a strong shock
The electrostatic force will attract the ground so the plane cannot take off
It might cause a spark to ignite the fuel
The electrons might explode
Static electricity is caused by
Friction between insulating materials
Friction between conducting materials
Friction between a conducting and an insulating material
Friction between electrons
Which of these is not true about using static to spray paint a car
The paint droplets are charged
The paint droplets repel each other
The car body is charged to attract the paint
The car and the paint have the same charge
What is the symbol for potential difference?
P
I
V
R
