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Tutorial 5,6
1
The current in a closed circuit is actually the
(A)
(B)
(C)
(D)
2
closed circuit.
electrical charge.
electro-motive force.
magneto-motive force.
A current of 0.000010009 A can be written as
(A)
(B)
(C)
(D)
5
resistance.
closed circuit.
electrical charge.
potential difference.
An electrical force that pushes the flow of electrons from the negative (-) terminal
to the positive (+) terminal of the power supply is known as
(A)
(B)
(C)
(D)
4
resistance to an electron flow.
rate of flow of electrical charge.
protons being detached from the atoms.
electrical pressure exerted in the circuit.
An electrical force that pushes electrons into motion thus constituting current flow
is known as
(A)
(B)
(C)
(D)
3
Instruments DC Cct - Ohm’s Law
100.09 mA.
10.01 mA.
100.09 A.
10.01 A.
Which of the following shows an ammeter connected properly for measuring the
current through the lamp?
(A)
+
A
(B)
A
EF/JN
+
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Tutorial 5,6
Instruments DC Cct - Ohm’s Law
(C)
-
A
+
(D)
+
6
Which one of the following items is required to produce a current flow in a circuit?
(A)
(B)
(C)
(D)
7
9
Current divided by resistance.
Resistance divided by current.
Power divided by resistance.
Resistance multiplied by current.
An emf of 10V causes a current of 2000 mA to flow in a circuit. Calculate the
resistance of the circuit.
(A)
(B)
(C)
(D)
What
it?
(A)
(B)
(C)
(D)
EF/JN
Capacitance.
Current.
Impedance.
Voltage.
According to Ohm's Law, voltage is equal to
(A)
(B)
(C)
(D)
8
A
-
0.5 .
2 .
5
50 .
is the current flow in a 50  resistor if the voltage of 100V is applied across
1
2
3
4
A.
A.
A.
A.
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Tutorial 5,6
10
Instruments DC Cct - Ohm’s Law
Refer to Figure 1. What is the value of R?
(A)
(B)
(C)
(D)
0.6 .
6 .
150 .
1500 .
R
20mA
30 V
Figure 1
11
Refer to Figure 2. If the current through R1 is 10 mA, then the current through
R2 must be
(A)
(B)
(C)
(D)
10 mA.
20 mA.
0.1 A.
0.2 A.
R1
R2
100
200
3V
Figure 2
12
Which one of the following units is not involved in Ohm's Law?
(A)
(B)
(C)
(D)
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Ampere.
Farad.
Ohm.
Volt.
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Tutorial 5,6
13
How many times will the total current flow increase through a circuit if the voltage
of a series circuit is doubled and the resistance remains the same?
(A)
(B)
(C)
(D)
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directly proportional to resistance and voltage.
indirectly proportional to resistance and voltage.
directly proportional to resistance and inversely proportional to voltage.
directly proportional to voltage and inversely proportional to resistance.
What is the current flow in a 120  resistor if a voltage of 240 V is applied across
it?
(A)
(B)
(C)
(D)
17
160 mV.
16 V.
16 kV.
6 250 kV.
Ohm's Law states that current is
(A)
(B)
(C)
(D)
16
Halved.
Doubled.
Quadrupled.
Remain the same.
When a current of 1.6mA passes through a resistor of 10k, the voltage drop
across the resistor is
(A)
(B)
(C)
(D)
15
Instruments DC Cct - Ohm’s Law
1
2
3
4
A.
A.
A.
A.
Which of the following diagrams illustrates Ohm's Law?
(A)
I
V
R
(D)
V
EF/JN
V
R
(B)
I
I
(C)
R
R
V
I
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