A TV has a power rating of 10W, and is left on for two minutes. How much energy does it use? (Hint: first, convert minutes into seconds, then use energy = power x time)
There are 60 seconds in a minute, so 2 minutes is 120 seconds.
Using the formula energy = power x time:
energy = 10W x 120s
energy = 1200 Joules
Therefore, the TV uses 1200 Joules of energy over the two minute period.
To find out how much energy the TV uses, we need to multiply the power rating of the TV by the time it is left on.
First, let's convert the time from minutes to seconds:
2 minutes = 2 x 60 seconds = 120 seconds
Now, we can calculate the energy using the formula energy = power x time:
Energy = 10W x 120 seconds
Energy = 1200 watt-seconds
Therefore, the TV uses 1200 watt-seconds (or joules) of energy when left on for two minutes.