Font size
Worksheets16.3 Electric current 2019-2023 IG [Mastery check]
Total questions: 26
Worksheet time: 15mins
A battery is connected to an ammeter and a resistor. The ammeter reading is 0.20 A. An electrical insulator is connected in parallel with the resistor. What is the ammeter reading?
0 A
between 0 A and 0.20 A
0.20 A
greater than 0.20 A
Which graph of current I against time t represents an alternating current (a.c.)?
(a)
A student uses an ammeter to measure the current in a resistor. He considers three different circuits, as shown.
In which of the circuits does the ammeter measure the current in the resistor?
1, 2 and 3
1 and 2 only
1 only
3 only
Which substances both contain large concentrations of free electrons?
aluminium and glass
copper and water
copper and nylon
silver and gold
A power source is connected to a resistor XY.
In which directions are the conventional current and the flow of free electrons through the resistor?
X to Y; X to Y
X to Y; Y to X
Y to X; X to Y
Y to X; Y to X
The diagram shows an electric circuit.
In which direction do free electrons flow around this circuit and what quantity does the ammeter measure?
anticlockwise, charge passing each point in the circuit per unit time
anticlockwise, total charge passing through the ammeter
clockwise, charge passing each point in the circuit per unit time
clockwise, total charge passing through the ammeter
Which substances both contain large concentrations of free electrons?
aluminium and glass
copper and water
copper and nylon
silver and gold
Which particles move to cause a current in a copper wire?
copper atoms
electrons from the copper atoms
protons from the copper nuclei
neutrons from the copper nuclei
Which statement about electric current in a conductor is correct?
In a d.c. circuit, the electric current gradually decreases along the conductor.
In a d.c. circuit, the free electrons flow back and forth.
In an a.c. circuit, the electric current remains exactly the same all the time.
In an a.c. circuit, the flow of charge changes direction continually.
What is an electric current in a metal wire?
a flow of electrons
a flow of neutrons
a flow of nucleons
a flow of protons
The diagram shows a reading on an ammeter. What is the reading?
0.45 A
0.50 A
4.5 A
5.0 A
Which row describes conventional current and electron flow in a circuit containing a cell?
conventional current: from the negative terminal of the cell to the positive terminal of the cell; electron flow: from the negative terminal of the cell to the positive terminal of the cell
conventional current: from the negative terminal of the cell to the positive terminal of the cell; electron flow: from the positive terminal of the cell to the negative terminal of the cell
conventional current: from the positive terminal of the cell to the negative terminal of the cell; electron flow: from the negative terminal of the cell to the positive terminal of the cell
conventional current: from the positive terminal of the cell to the negative terminal of the cell; electron flow: from the positive terminal of the cell to the negative terminal of the cell
Which graphs show an alternating voltage?
P and Q only
P and R only
Q and R only
P, Q and R
The graphs show how the currents in three circuits vary with time.
In which circuits is there a direct current?
1 and 2
1 and 3
2 only
3 only
Which circuit shows a meter being used correctly to measure the current in a resistor?
(a)
The information describes the currents in three different circuits. Circuit P has a steady current of 0.52 A in one direction. Circuit Q has a current that continually changes between 0.25 A and 0.35 A but is always in the same one direction. Circuit R has a peak current of 0.52 A that changes direction periodically. Which circuits contain a direct current?
P only
P and Q
Q and R
R only
In which circuit is the ammeter measuring the flow of charge through the lamp?
(a)
In circuit 1, a negative charge flows in a clockwise direction. The bulb is bright.
In circuit 2, the battery is reversed as shown. The bulb is equally bright.
Which charge flows in circuit 2 and in which direction?
negative, anticlockwise
negative, clockwise
positive, anticlockwise
positive, clockwise
Which device is used to measure the flow of charge in an electrical circuit?
ammeter
voltmeter
battery
newton meter
An electric current in a copper wire is due to the flow of charge. Which particles are moving along the wire?
α-particles
copper nuclei
electrons
protons
Which row correctly shows a conductor and an insulator?
rubber | plastic
iron | nylon
air | wood
copper | steel
A lamp is connected to a cell. Which circuit diagram shows the direction of conventional current I and also the direction of flow of electrons e?
(a)
Which row is correct?
I = Q/t, from positive terminal to negative terminal
I = Q/t, from negative terminal to positive terminal
I = Q × t, from positive terminal to negative terminal
I = Q × t, from negative terminal to positive terminal
A resistor is connected to a cell so that there is a current from the positive terminal of the cell to the negative terminal.
What causes the current in the resistor?
electrons moving from the negative terminal of the cell to the positive terminal
electrons moving from the positive terminal of the cell to the negative terminal
protons moving from the negative terminal of the cell to the positive terminal
protons moving from the positive terminal of the cell to the negative terminal
Which combination of the current in a resistor and the time for which it is present results in a charge of 240C passing through the resistor?
a current of 2.0A for 120 s
a current of 4.0A for 960 s
a current of 6.0A for 40 minutes
a current of 8.0A for 30 minutes
There is a current of 3.0 A in a resistor for time t.
During time t, a charge of 120 C flows through the resistor.
What is time t?
0.025 minutes
0.025 s
40 minutes
40 s
