Question

An electric bulb is rated 100w ;230v the supply voltage drops to!115v what is the heat energy produced in bulb in 20min? ​

Answer 1

Answer:120kJ

Explanation:

Energy=Power  * time

Answer 2

$Q=60,000\ J$ of heat is produced during the given time.

Explanation:

Given:

• power rating of electric bulb, $P=100\ W$

• voltage rating of the bulb, $V_0=20\ V$

• voltage supply to the bulb, $V_a=115\ V$

• time of electric supply, $t=20\times 60=1200\ s$

Now the capacity of current that the bulb can carry:

$P=V_0\times I$

$100=230\times I$

$I=\frac{10}{23} \ A$

Now the actual power flowing through the bulb:

$P_a=V_A\times I$

$P_a=115\times \frac{10}{23}$

$P_a=50\ W$

Now the heat generated:

$Q=P_a\times t$

$Q=50\times 1200$

$Q=60,000\ J$ of heat is produced during the given time.

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TOPIC: power, current, voltage

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