8 Energy – forces doing work

An energy meter records that an electric drill draws $J18\,000\ \text{J}$ from its battery while making one hole.

During this task, the drill transfers $J11\,700\ \text{J}$ usefully to the rotating drill bit.

Calculate the proportion of the battery's energy that the drill transfers usefully during this task.

[2]

An energy meter records that an electric drill draws $J18\,000\ \text{J}$ from its battery while making one hole.

During this task, the drill transfers $J11\,700\ \text{J}$ usefully to the rotating drill bit.

Calculate the proportion of the battery's energy that the drill transfers usefully during this task.

[2]

8 Energy – forces doing work Questions