Question

How long it takes a 100 watt light bulb to use 10,000 J of electrical energy?​

Answer 1

Answer:

A 100-watt light bulb takes 100 seconds to use 10,000 J of electrical energy.

Explanation:

Power refers to the amount of work done (or energy consumed) per unit of time. It is usually measured in watts (W), which is equal to 1 Joules per second ($\frac{J}{s}$)

So, by definition, to calculate the power consumed or supplied in a time interval the following expression is used:

$P=\frac{W}{t}$

where P is the power measured in Watts, W is the work measured in Joules, and t is the time measured in seconds.

In this case:

• P=100 Watt
• W= 10,000 J
• t= ?

Replacing:

$100 Watt=\frac{10,000 J}{t}$

Solving:

$t=\frac{10,000 J}{100 Watt}$

t=100 seconds

A 100-watt light bulb takes 100 seconds to use 10,000 J of electrical energy.