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An electric heater is operated by applying a potential difference of 60 V across a nichrome wire of total resistance 9-ohm. What is the power rating of the heater?

Sagot :

[tex]\tt{\huge{\blue{Explanation:}}}[/tex]

The power rating of a load given its voltage and resistance is

[tex]\boxed{P = \frac{V^{2}}{R}}[/tex]

where:

P = power

V = voltage

R = resistance

[tex]\tt{\huge{\red{Solution:}}}[/tex]

Solving for P

[tex]P = \dfrac{V^{2}}{R}[/tex]

[tex]P = \dfrac{(\text{60 V})^{2}}{\text{9 ohm}}[/tex]

[tex]\boxed{P = \text{400 W}}[/tex]

Therefore, the power rating of the electric heater is 400 W

[tex]\\[/tex]

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