Question

Example 4 : Determine the current that
will flow when a potential difference of
33 V is applied between two ends of an
appliance having a resistance of 110 ohm. If
the same current is to flow through an
appliance having a resistance of 500 ohm
how much potential difference should be
applied across its two ends?​

Answer 1

Explanation:

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.