WorksheetsElectricity GCSE - Circuits
Total questions: 30
Worksheet time: 43mins
What is the best definition for current.
the flow of charge.
how much charge flows past a point in a unit of time.
how much charge there is around the circuit.
the energy used by charge as it flows.
A current of 1.5 A flows for a time and a total of 15 C of charge flows past each point in a circuit. How long does the current flow?
22.5 s
10 s
0.1 s
16.5 s
How should an ammeter be connected to measure the current through a bulb?
In series with the bulb.
In parallel with the bulb.
It doesn't matter, you'll always get the same reading.
potential difference (Voltage) can be calculate from...
Voltage = Energy x Charge
Voltage = Energy x Current
Voltage = Energy / Charge
Voltage = Energy / Current
What is the voltage across a light bulb if it uses 100 J of energy per second and 0.5 coulombs of charge per second.
(a)
What is the relationship between potential difference, current and resistance across a component.
V = I/R
I = V x R
V = R/I
V = I x R
What is the resistance of the R2 resistor if the current is 0.8 A in ohms? (value only needed, no units.
(a)
What is the value of the voltage (V1)? (value only needed, no units.
(a)
Which type of circuit is better in a situation where you need to control several lights individually with different switches, but they all run off the same power supply?
Series
Parallel
Either.
Neither.
What is the unknown current at this wire junction? value and units.
(a)
What is the voltage on the 75 ohm resistor (V1)?
187.5 V
120 V
93.75 V
60 V
What is the current through the 75 ohm resistor (V1)?
(a)
A student measures the current across a component as the voltage is increased. What is this component most likely to be?
A commercial resistor.
A Thermistor.
An LDR.
A light bulb.
A wire in a water bath.
As the gradient of the graph line decreases this shows that the resistance is...
decreasing.
staying constant.
increasing.
the line has nothing to do with resistance.
The formula for electrical power is.
P = I x V
P = V/I
P = V/R
P = I x R
P = I/R
The units for electrical power are? (one word needed)
(a)
A light bulb runs on 12 V and 0.8 A what is the input power? (no unit needed).
(a)
If each cell provides a potential difference of 1.5 volts.What is the total potential difference provided by the four cells in the circuit?
(a)
In the circuit what is the name of the component labelled X?
Variable Resistor
Light-Dependent resistor
Thermistor
Resistor
Varying the voltage across a component and measuring the current a student collected some results.
The results obtained by the student have been plotted on a graph.
Which one of the following is the most likely cause of the anomalous result on this graph?
The resistance of the resistor changed.
The student misread the ammeter.
The Voltmeter had a zero error.
The ammeter had a zero error.
They didn't allow time for charge to build up in the circuit.
Varying the voltage across a component and measuring the current a student collected some results.
The results obtained by the student have been plotted on a graph.
What is the resistance of this component in ohms? (value only needed)
(a)
What is the component with the voltmeter across it?
A resistor
A variable resistor
An LDR
A Thermistor
The current in the circuit is 3.5 mA when the potential difference across the thermistor is 4.2 V
Calculate the resistance of the thermistor in ohms. (value only needed).
(a)
What will happen to the voltage reading if the temperature on the thermistor increases?
it increases
it decreases
it stays the same
Which graph shows the IV graph for a Diode?
The ammeter displays a reading of 0.10 A.Calculate the potential difference across the 45 Ω resistor.
(a)
The ammeter displays a reading of 0.10 A.
Calculate the resistance of the resistor labelled R in ohms. (no units needed)
(a)
State what happens to the total resistance of the circuit and the current through the circuit when switch S is closed.
The resistance decreases and the current decreases
The resistance increases and the current increases
The resistance increases and the current decreases
The resistance decreases and the current increases
If switch S is open (as in the diagram), what is the power used by the 60 ohm resistor? The current in the circuit is 0.1 A.
(a)
If two circuits are constructed both with two 60 ohm light bulbs and a 12 V power supply.
What is true of the total power in each circuit?
The same.
Less in parallel.
Double in parallel.
Four times greater in parallel.
