Electricity Test

Result

Electricity Test - 7

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Weekly Quiz Competition

Question 1
1 / -0

How much work is done in moving a charge of 2 C across two points having a potential difference 12 V?

A
48 J

B
36 J

C
32 J

D
24 J

Solution

The amount of charge Q, that flows between two points at potential difference

V = 12 V is 2 C.

Thus, the amount of work W, done in moving the charge is W = VQ = 12 V × 2 C = 24 J.
Question 2
1 / -0

The potential difference is measured by means of an instrument called the ________. This device is always connected in ______ across the points between which the potential difference is to be measured.

A
multimeter, series

B
ammeter, parallel

C
voltmeter, parallel

D
barometer, series

Solution

The potential difference is measured by means of an instrument called the voltmeter. The voltmeter is always connected in parallel across the points between which the potential difference is to be measured.

The purpose of voltmeter is to measure the potential drop across the load and to analyze the working of the circuit. It is always connected in parallel across the point which the potential difference to be measured.
Question 3
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The __________ is defined as the total amount of charge flowing through a wires of certain cross-section area per unit time,

A
Electric potential

B
Electric field

C
Electric charge

D
Electric current

Solution

The electric current is expressed as the total amount of charge flowing through a conductor per unit time. If certain amount of charge is flowing across the cross-section of a wire per unit time, it is said that the conductor has current.
Question 4
1 / -0

An instrument called _________ measures electric current in a circuit. It is always connected in _______ in a circuit through which the current is to be measured.

A
voltmeter, parallel

B
tachometer, series

C
Ammeter, parallel

D
Ammeter, series

Solution

An instrument called ammeter measures electric current in a circuit. It is always connected in series in a circuit through which the current is to be measured

An ammeter is used to measure the amount of current flowing in a circuit to analyze the circuit. It is always connected in series with the load, otherwise the ammeter malfunctions.