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Redraw the circuit of putting in an ammeter to measure the current through the resistor and a voltmeter to measure the voltage across the 12ohm resistor. What would be the reading in the ammeter and the voltmeter?

Posted by Devil Imran Khan 5 years, 2 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 5 years, 2 months ago

An ammeter should be connected in the circuit in series with the resistors. To measure the potential difference across the resistor it should be connected in parallel, as shown in the following figure
The resistances are connected in series.
Ohm’s law can be used to obtain the readings of ammeter and voltmeter. According to Ohm’s law,
V = IR,
Where,
Potential difference, V = 6 V
Current flowing through the circuit/resistors = I
Resistance of the circuit, R = 5 + 8 + 12 = 25ohm
I = V/R = 6/25 = 0.24 A
Potential difference across 12ohm resistor = V1
Current flowing through the 12ohm resistor, I = 0.24 A
Therefore, using Ohm’s law, we obtain
V1 = IR = 0.24 x 12 = 2.88 V
Therefore, the reading of the ammeter will be 0.24 A.
The reading of the voltmeter will be 2.88 V.

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CBSE > Class 10 > Science