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Byju's Answer
Standard XII
Physics
Non-Ideal Battery
How to calcul...
Question
How to calculate ammeter and voltmeter readings?
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Solution
Ammeter readings
An ammeter is used to measure the current across a given conductor.
This gives the measure of the total charge that is flowing through the conductor in unit time.
An ammeter is connected in series with the circuit because the current through a series circuit is always equal.
There are two types of ammeter, analog ammeter, and digital ammeter.
In an analog ammeter, the pointer rotates over a given scale, and the unit is mentioned.
The value over which the pointer hovers plus the unit given on the ammeter, say
A
or
m
A
gives us the value of the current.
In a digital ammeter, the current passing through the circuit is shown digitally.
Voltmeter readings
A voltmeter is used to measure the potential difference across a given conductor.
This gives the measure of the voltage through the conductor.
A voltmeter is connected in parallel with the resistance present in the circuit because the voltage through a parallel circuit is always equal.
There are two types of voltmeter, analog voltmeter, and digital voltmeter.
In an analog voltmeter, the pointer rotates over a given scale.
The value over which the pointer hovers plus the unit given on the voltmeter, say
V
or
m
V
gives us the value of the voltage.
In a digital voltmeter, the potential difference of the circuit is shown digitally.
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Similar questions
Q.
If the resistance
R
1
is increased, how will the readings of the ammeter and voltmeter change?
Q.
A student arranged an electric circuit as shown alongside:
He would observe:
(1) no reading in either the ammeter or the voltmeter
(2) no reading in the voltmeter but a reading in the ammeter
(3) no reading in the ammeter but a reading in the voltmeter
(4) readings in both the ammeter and the voltmeter