An ammeter placed in a series with a resistor reads 200 milliampere and a voltmeter connected in parallel with a resistor reads 2 v.what is the resistance of the resistor?
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Total current in ammeter is 0.8 A
Current through 20 ohm resistor is 0.3 A, hence the voltage across it is
V=0.3×20=6V
Current through 15 ohm resistor is
I=
R
V
=
15
6
=0.4A
Hence current through R1 is, I' = 0.8 - (0.3+0.4) = 0.1 A
Therefore,
R1=
I
′
V
=
0.1
6
=60Ω
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