A hot electric iron has a resistance of 80 - and is used on a 200 V source- The electrical energy spent- if used for 2h is -

The correct option is A 1000 WhThe resistance, R = 80 Ω Voltage, V = 200 Vt = 2h #160;The relation for power is given by D = P = V^2/R = (200 ...

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Standard X

Physics

Electric Power

A hot electri...

Question

A hot electric iron has a resistance of $80 Ω$ and is used on a 200 V source. The electrical energy spent, if used for 2h is :

8000 Wh

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2000 Wh

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1000 Wh

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300 Wh

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Solution

The correct option is A 1000 Wh
The resistance, $R = 80 Ω$
Voltage, V = 200 V
t = 2h
The relation for power is given by $D = P = \frac{V^{2}}{R}$
$= \frac{(200)^{2}}{80} = 500 W$
The energy spent
= power $\times$ time
= 500 $\times$ 2 = 1000 Wh

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A hot electric iron has a resistance of 80Ω and is used on a 200 V source. The electrical energy spent, if used for 2h is :

The correct option is A 1000 WhThe resistance, R=80ΩVoltage, V = 200 Vt = 2h The relation for power is given by D=P=V2R=(200)280=500WThe energy spent = power × time= 500 × 2 = 1000 Wh

A hot electric iron has a resistance of $80 Ω$ and is used on a 200 V source. The electrical energy spent, if used for 2h is :

The correct option is A 1000 Wh
The resistance, $R = 80 Ω$
Voltage, V = 200 V
t = 2h
The relation for power is given by $D = P = \frac{V^{2}}{R}$
$= \frac{(200)^{2}}{80} = 500 W$
The energy spent
= power $\times$ time
= 500 $\times$ 2 = 1000 Wh