Edexcel GCSE Combined Science
Topic questions Electricity Standard circuit diagram symbols
12 questions · 115 marks · about 2 hours
Figure 1 shows a circuit containing a battery and four other components.
Label the four components in Figure 1, using words from the box.
The circuit in Figure 1 is switched on.
A charge of 1.2 C leaves the battery in a time of 4.0 s.
Calculate the current in the circuit.
Use the equation
current =........ A
A student investigates how current varies with potential difference across a filament lamp.
The student uses a power supply, a variable resistor, the filament lamp and two meters.
Part of the circuit diagram is shown in Figure 10.
Complete the circuit diagram needed for this investigation.
Figure 10
Another student repeats the investigation in part (a) using a data logger.
The data logger records observations using sensors instead of meters. The sensors are connected to a computer to collect and display the observations.
The data logger collects 555 pairs of data in 2 minutes.
The results are shown in Figure 11.
Suggest one advantage of using a data logger instead of meters in this investigation.
Describe how current varies with potential difference in the graph in Figure 11.
Use data from the graph in Figure 11 to show how the resistance changes with potential difference for the filament lamp.
Which of these equations is correct?
The unit of work is the joule.
Starting with the meaning of work, we may obtain an equivalent unit of work as Nm.
Using work 
F 
d
unit of work 
unit of force 
unit of distance Nm
The unit of potential difference is the volt.
Explain how, starting with the meaning of potential difference, we may obtain an equivalent unit of potential difference.
Figure 1 shows the parts in an electrical circuit.
Draw the circuit diagram of this electrical circuit in the space provided.
The battery symbol and some of the connecting wires have been drawn for you.
Figure 2 shows the current flowing into and out of point P in part of a circuit.
Which of these is the value of current I ?
There is a current of 0.46 A in a lamp.
Calculate the total charge that flows through the lamp in 30 seconds.
Use the equation
charge = current
time in seconds
charge =........ C
The voltage across the lamp is 6.0 V.
The current in the lamp is 0.46 A.
Calculate the energy transferred to the lamp in one minute.
Use the equation
energy transferred = current
voltage
time in seconds
energy transferred =........ J
The voltage (potential difference) across a length of wire is 1.5 V.
A charge of 0.042 C flows through the wire.
Calculate the energy transferred.
Use the equation
E =........ J
Figure 12 shows some of the apparatus that students use to determine the resistance of a piece of iron wire.
Add connecting wires, a voltmeter and an ammeter to complete the circuit in Figure 12 so that the students can determine the resistance of the piece of iron wire.
The students extend the investigation to determine how the resistance of the iron wire changes with its length.
Give the name of one additional piece of apparatus the students would need.
Figure 13 shows a graph of the results.
Draw a straight line of best fit on Figure 13.
Use Figure 13 to estimate the resistance of a 100 cm length of the iron wire.
resistance =........ Ω
The variable resistor shown in Figure 12 is used to prevent the iron wire from becoming too hot.
Explain how the variable resistor is used to prevent the iron wire from becoming too hot.
The potential difference (voltage) across another piece of wire is 1.56 V.
The current in the wire is 0.45 A.
Calculate the resistance of this piece of wire.
Use the equation
resistance =........ Ω
This question is about electrical circuits.
Draw one straight line from each circuit symbol to its description.
Figure 1 shows a lamp in a circuit.
The lamp is switched on.
The current in the lamp is a flow of
The current in the lamp is 0.21 A.
Calculate the charge that flows through the lamp in a time of 300 s.
State the unit of charge.
Use the equation
charge = current × time
charge =........ unit........
Figure 9 shows a lamp connected to a d.c. power supply.
The power supply provides a potential difference (voltage) of 4.5 V.
The current in the lamp is 0.30 A.
Calculate the resistance of the lamp.
Use the equation
resistance =........ Ω
Calculate the power supplied to the lamp.
power =........ W
Another identical lamp is added to the circuit, as shown in Figure 10.
The power supply provides the same potential difference as it provided in the circuit in Figure 9.
State and explain the difference between the brightness of the lamp in Figure 9 and the brightness of a lamp in Figure 10.
A student is given a low voltage power supply and 1 m of resistance wire.
The student uses these and other pieces of equipment to measure the resistance of just 50 cm of the resistance wire.
Draw a diagram of the circuit that the student should use.
Your circuit diagram should identify the pieces of equipment that the student uses.
Describe the difference between direct current (d.c.) and alternating current (a.c.) in electrical circuits.
Figure 1 shows a lamp connected to a d.c. power supply.
The power supply provides a potential difference (voltage) of 4.5 V.
The current in the lamp is 0.30 A.
Calculate the resistance of the lamp.
Use the equation
resistance =........ Ω
Calculate the power supplied to the lamp.
power =........ W
Another identical lamp is added to the circuit, as shown in Figure 2.
The power supply provides the same potential difference as it provided in the circuit in Figure 1.
State and explain the difference between the brightness of the lamp in Figure 1 and the brightness of a lamp in Figure 2.
A student is given a low voltage power supply and 1 m of resistance wire.
The student uses these and other pieces of equipment to measure the resistance of just 50 cm of the resistance wire.
Draw a diagram of the circuit that the student should use.
Your circuit diagram should identify the pieces of equipment that the student uses.
Which of these shows the correct circuit symbol for a thermistor?
A student investigates how the resistance of a thermistor varies with temperature.
Figure 7 shows a graph of the results of this investigation.
Describe how the resistance of this thermistor varies with temperature.
Draw the tangent to the curve at a temperature of 30 °C, to find the rate of change of resistance with temperature at 30 °C.
State the unit.
rate of change of resistance with temperature at 30 °C =........ unit........
Figure 8 shows the apparatus used for this investigation.
Explain one improvement in measurement that the student could make in the investigation.
In this investigation, the resistance can be measured in two ways.
Method 1 – use an ohmmeter.
Method 2 – use an ammeter and a voltmeter.
Method 1
Method 2
using an ohmmeter
using an ammeter and voltmeter
Figure 9
Explain why method 2 gives more precise results than method 1.
Figure 1 shows an electrical circuit.
Draw a circuit diagram of the electrical circuit in Figure 1 in the space below.
When the current in a lamp is 0.15 A, the resistance of the lamp is 40 Ω.
Calculate the voltage across the lamp.
Use the equation
V = I × R
voltage =........ V
Figure 2 shows an ammeter that can read up to 5 A.
State the value of the current shown on the ammeter in Figure 2.
current =........ A
A student investigates resistors connected in parallel using a number of resistors. Each resistor has the same resistance.
Figure 10 shows a circuit diagram with one resistor, R.
Add to Figure 10:
a voltmeter to find the potential difference across resistor R
another resistor in parallel with resistor R.
State the measurements that the student must take to find the overall resistance of the resistors in parallel.
The student investigates how the overall resistance of the circuit changes when additional resistors are added in parallel to R.
Each resistor has the same resistance.
Figure 11 shows the results of the student’s investigation.
State the resistance of a single resistor.
resistance =........ Ω
Comment on the relationship between the overall resistance of the circuit and the number of resistors in parallel.
Use information from Figure 11 to support your answer.
A different circuit is then set up with two resistors as shown in Figure 12.
Calculate the potential difference across the 15 Ω resistor.
potential difference =........ V
Calculate the total power dissipated when there is a current of 0.20 A in the two resistors.
Use the equation
power produced........ W
Which of these symbols is used to represent a thermistor in an electrical circuit?
A student investigates how the current in a lamp changes with the potential difference across the lamp.
The student uses the results to calculate the resistance of the lamp.
The results are shown in the table in Figure 9.
One value of resistance is missing from the table in Figure 9.
Calculate the value of resistance that is missing from the table.
missing resistance =........ Ω
The student writes this conclusion:
‘The resistance of the lamp is directly proportional to the potential difference.’
Comment on the student’s conclusion. Use information from Figure 9 in your answer.
*(c) Figure 10 shows a battery connected to a filament lamp.
Explain, in terms of the movement of charged particles, how energy is transferred from the battery, through the lamp, to the surroundings.
Which of these symbols is used to represent a thermistor in an electrical circuit?
A student investigates how the current in a lamp changes with the potential difference across the lamp.
The student uses the results to calculate the resistance of the lamp.
The results are shown in the table in Figure 2.
One value of resistance is missing from the table in Figure 2.
Calculate the value of resistance that is missing from the table.
missing resistance =........ Ω
The student writes this conclusion:
‘The resistance of the lamp is directly proportional to the potential difference.’
Comment on the student’s conclusion. Use information from Figure 2 in your answer.
The student used a power supply that had fixed output voltage settings. Each of these outputs was a whole number of volts.
Describe how the student could add a component to the circuit that would provide a continuously variable voltage across the lamp.
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