Question

an electric heater draws a current of 5A when connected from. source of 220V. what current will it draw when connected to a source of 60V
​

Answer 1

Answer

The required current is 1.36 Ampere

$\bf\large\underline{Given}$

• An electric heater draws a current of 5A when connected from source of 220V.

$\bf\large\underline{To \ Find}$

• The current when the heater is connected to a source of 60V

$\bf\large\underline{Solution}$

Given ,

I₁= 5A

V₁ = 220V

R = ?

$\sf \underline{\underline{By \: Ohm's \: Law }}$

$\sf V = IR \\\\ \sf\implies R = \dfrac{V}{I} \\\\ \sf\implies R = \dfrac{V_{1}}{I_{1}} \\\\ \sf\implies R = \dfrac{220}{5} \\\\ \sf\implies R = 44 \Omega$

Therefore, the resistance of the heater is 44Ω

Again , when the heater is connected with a source of 60V

$\sf\implies I_{2} = \dfrac{V_{2}}{R} \\\\ \sf\implies I_{2} = \dfrac{60}{44} \\\\ \sf\implies I_{2} = \dfrac{15}{11} \\\\ \sf\implies I_{2} = 1.36 A$

Therefore, the required current drawn by the heater is 1.36 A