Question

Question 7 :
An electric heater draws 4 A from a 90 V
source. The resistance of the heating
element is​

Answer 1

Answer:

your answer is in attachment

Explanation:

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Answer 2

Answer:

Correct Answer is 22.5 Ω, i.e., if an electric heater draws 4 A current from a 90 V source, then the resistance of heating element will be 22.5 Ω.

Explanation:

According to Ohm's Law, across a particular section of wire, the potential difference between it's ends is directly proportional to the current flowing through that section. Hence,

V∝I ⇒ V=RI or V=IR

where R is proportionality constant also known as Resistance of wire.

From above formula, we get R=V÷I

Hence, we put values of V and I in the formula and find the value of R :

V = 90 V and I = 4 A

R=90÷4

R=22.5 Ω