Question

An electric heater is rated 1000w, 250v. calculate the resistance​

Answer 1

Correct answer: R = 62.5Ω

Step-by-step explanation:

Power P = U · I = U · U/R = U²/R => P = U²/R => R= U²/P

R = 250²/1000 = 62.5Ω

God is with you!!!

Answer 2

Explaination :

Here we have been given with the power (P) and potential difference (V) of a electric heater.

• P = 1000W
• V = 250V

We need to calculate the resistance across the heater.

★ As we know that :

• P = V² / R

Here,

• P is power
• V is voltage i.e., potential difference
• R is resistance

Putting the values :

>> 1000 = (250)² / R

>> 1000 = 250 × 250 / R

>> R = 250 × 250 / 1000

>> R = 25 × 25 / 10

>> R = 25 × 5 / 2

>> R = 125 / 2

>> R = 62.5Ω

★ Henceforth,

• Resistance is 62.5Ω.