Question

How much power is used by a light bulb if it transfer 100 joules of energy every 2 seconds?​

Answer 1

It transfers 50 joules per second

Using the formula Power = Energy / Time, that corresponds to 50 joules/second

Since 1 watt equals 1 joule/second, the power used is 50 watts.

Step-by-step explanation:

What we know:

• The light bulb transfers 100 joules of energy every 2 seconds

What we need to find:

• The power used by the light bulb, in watts

Determine the energy transferred per second. Since the light bulb transfers 100 joules every 2 seconds, that's:

• 100 joules / 2 seconds = 50 joules/second

We know that power is equal to energy divided by time. In this case:

• Power = Energy / Time
• = 50 joules / 1 second
• = 50 joules/second

Convert joules/second to watts:

• 1 watt = 1 joule/second

So 50 joules/second corresponds to 50 watts.

Therefore, the power used by the light bulb is:

50 watts

Answer 2

`\huge\boxed{\sf P = 50 \ watts}`

Step-by-step explanation:

Given data:

Energy = E = 100 J

Time = t = 2 s

Required:

Power = P = ?

Formula:

Power = Energy / Time

Solution:

Power = 100 / 2

Power = 50 watts

`\rule[225]{225}{2}`