Question

the potential difference between the terminals of an electric heater is 40 v when it draws a current of 5 A from the source. if the potential difference is increased to 120 v then-current draw by heater will be

Answer 1

Answer:

See the Above solution.

Answer 2

Given:

The potential difference between the terminals of an electric heater is 40 v when it draws a current of 5 A from the source.

To find:

Currentdrawn by the heater if the potential difference is increased to 120 volts.

Calculation:

Let resistance of heater be R;

$\rm{ \therefore \: voltage = current \times R}$

$\rm{ = > \: 40= 5 \times R}$

$\rm{ = > \: R = \dfrac{40}{5} }$

$\rm{ = > \: R = 8 \: ohm}$

Now , in the 2nd case , when potential difference is increased to 120 volts:

$\rm{ \therefore \: voltage = current \times R}$

$\rm{ = > \: 120= current\times R}$

$\rm{ = > \: 120= current\times 8}$

$\rm{ = > \: current = \dfrac{120}{8} }$

$\rm{ = > \: current = 15 \: amp }$

So, final answer is:

$\boxed{ \bf{ \: current = 15 \: amp }}$