WorksheetsUnit 17 Current of Electricity Quiz (21MIN)
Total questions: 30
Worksheet time: 21mins
A circuit has 1250 C flowing through it for 25 seconds. What is the current in the circuit?
25 A
50 A
1250 A
6.25 × 1023 A
What is the time taken when the amount of 1500 C flows through a fixed point to give a current of 10 A?
1.5 minutes
2.0 minutes
2.5 minutes
3.0 minutes
Study the circuit below.
What is the voltage V in the circuit?
2 V
4 V
16 V
32 V
Four identical resistors are used in a circuit. Which of the following arrangements gives rise to the lowest effective resistance?
A
B
C
D
In which unit is potential difference measured?
ampere
ohm
volt
watt
When the potential difference (p.d.) across a piece of resistance wire is changed, the current through the wire also changes. The temperature of the wire stays the same. Which graph shows how the p.d. and the current are related?
A
B
C
D
Which diagram shows possible currents at a junction in a circuit?
A
B
C
D
Calculate the energy required to drive 10 C of charge across two points with a potential difference of 20 V.
0.5 J
2.0 J
20 J
200 J
Why are birds able to perch on overhead transmission lines without being electrocuted?
Their feet are insulated.
There is no potential difference between their feet.
They have very high resistance.
They perch on wires of different potential.
The diagram below shows an electric circuit. Which of the following shows the correct set of ammeter and voltmeter readings when the circuit is connected to a power supply?
I = 0.5 A, V = 9.0 V
I = 0.6 A, V = 9.6 V
I = 1.0 A, V = 8.0 V
I = 1.0 A, V = 10.0 V
Which of the following statements is true?
Current is the flow of charge.
The resistance of an ammeter is infinite.
The SI unit of the e.m.f. of a battery is the volt.
A voltmeter is connected in series with a component in order to measure the potential difference across it.
A battery is connected to a length of resistance wire. Which of the following changes will increase the current in the battery?
Changing the battery to one with lower e.m.f.
Changing the wire to one with a higher resistivity
Increasing the cross-sectional area of the wire
Increasing the length of the wire
Which of the following could be a unit of potential difference?
A s–1
A Ω–1
C J–1
J C–1
Which of the following describes the changes in the voltmeter and ammeter readings when the battery of a simple circuit is changed to one with a higher e.m.f.?
Voltmeter and ammeter readings increase
Voltmeter reading increases and no change for ammeter reading
No change for voltmeter reading and increase in ammeter reading
No change for voltmeter and ammeter readings
The total resistance of this circuit is
25.7 ohms
315 ohms
32.4 ohms
15 ohms
A combination of three resistors of 10 Ohms, 30 Ohms and 20 Ohms is connected in the circuit. Which cannot be the effective resistance of all three resistors?
15 Ohms
22 Ohms
25 Ohms
60 Ohms
A piece of wire has a resistance of 8 ohms. A second piece of wire of the same composition, length and temperature, but having twice the radius, has a resistance of
1Ω
2Ω
4Ω
16Ω
As the temperature of a metallic conductor increases, its resistance usually
decreases
increases
remains the same
Which graph best represents a material behaving according to Ohm's law?
When the circuit shown below is closed, what will be the reading on the ammeter at B?
less than the reading at A
greater than the reading at A
the same as the reading at A
Compared to the potential drop across the 10 ohm resistor shown in the diagram, the potential drop across the 5 ohm resistor is
the same
twice as great
one-half as great
four times as great
In the circuit diagram below, what are the correct readings of voltmeters V1 and V2?
V1 reads 2.0 V and V2 reads 4.0 V
V1 reads 4.0 V and V2 reads 2.0 V
V1 reads 3.0 V and V2 reads 3.0 V
V1 reads 6.0 V and V2 reads 6.0 V
In the circuit shown in the diagram, if an ammeter is moved from position 1 to position 2, the current measured will
decrease
increase
remain the same
Two resistors of 10 ohms and 5 ohms are connected as shown in the diagram. If the current through the 10 ohm resistor is 1.0 ampere, then the current through the 5.0 ohm resistor is
15 A
2 A
0.5 A
0.3 A
Two resistors are connected to a source of voltage as shown in the diagram. At which position should an ammeter be placed to measure the current passing only through resistor R1?
1
2
3
4
Resistors R1 and R2, connected in parallel, have an equivalent resistance of 6.0 ohms when connected in the circuit shown below. R2 = 24 Ohms. The resistance of R1 could be
2 ohm
4 ohms
8 ohms
18 ohms
What is the current measured by ammeter A?
0.5 Amps
2 Amps
4 Amps
6 Amps
What is the effect on the current in a simple circuit if both the emf of the source and the only resistance are reduced by half?
divided by 2
multiplied by 2
no change
multiplied by 4
What is the resistance of a circuit connected to a 14.0-V battery if it supplies 2.70x102 J of energy in 20.0s?
7.56 Ω
10.4 Ω
14.5 Ω
18.9 Ω
