when a potential difference of 20v is applied across a metal wire a cu

1.	when a potential difference of 20v is applied across a metal wire a current of 0.6 A flow through it find corresponding power
Answer» According to Ohm's law, V = IR. That is, R = V/I. In this case, the voltage is 20 V and the CURRENT is 0.05 A. So, the resistance R = 20/0.05 = 400 ohms. Now, to make a current of 300 mA flow through the same resistor of 400 ohms, the POTENTIAL difference to be applied is calculated as follows. Here, I = 300 mA = 0.3 A and R = 400 ohms. Therefore, V = 0.3*400 = 120 V. Hence, to make a current of 300 mA flow through the same resistor of 400 ohms a potential difference of 120 V is applied.

when a potential difference of 20v is applied across a metal wire a current of 0.6 A flow through it find corresponding power

Answer»

According to Ohm's law, V = IR. That is, R = V/I.

In this case, the voltage is 20 V and the CURRENT is 0.05 A.

So, the resistance R = 20/0.05 = 400 ohms.

Now, to make a current of 300 mA flow through the same resistor of 400 ohms, the POTENTIAL difference to be applied is calculated as follows.

Here, I = 300 mA = 0.3 A and R = 400 ohms.

Therefore, V = 0.3*400 = 120 V.

Hence, to make a current of 300 mA flow through the same resistor of 400 ohms a potential difference of 120 V is applied.