Question

A d.c. supply of 120V is connected to a large resistance X.A voltmeter of resistance 10 kiloohm is placed after it in series in the circuit reads 4V. What is the value of X?

Answer 1

hope it may help u!!!!!!

Answer 2

The value of X is 290 K ohm or 290000 ohms.

Explanation:

The voltage drop across voltmeter is given as 4 volts.

Also the product of current and resistance will result in voltage.

Hence, 4 = I $\times$ 10000 ⇒ I =  4 $\times$ $10^-4$ A.

Now since the resistance that is applied in the circuit is in series with the circuit hence the current that is flowing in the link would be the same for all while the voltage drop at the resistance “X” would be drop off 44 falls from the total voltage 120 - 4 = 116 v.

Now again circuiting the same formula we can find the value of resistance as $\frac{116}{(4 \times 10^-4)}$.

So we would get the value of X as 290 K ohm or 290000 ohms.

To know more:

In the circuit diagram , suppose the resistors R1, R2, and R3 hav a value 5ohm,10ohm and 30 ohm , which have been connected to a battery of 12 v. calculate the current throufh each resistor , the total current in the circuit and the total circuit resistance ?

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