Question

Danielle is doing some diy. she uses a 1.2kw electric saw for 20 minutes and then a 1000w electric sander for half an hour. which job is the more expensive in terms of electricity used - sawing or sanding?

Answer 1

Based on the calculations, the electric sander (sanding) is the more expensive in terms of electricity used.

How to determine the more expensive?

Mathematically, the quantity of energy consumed by an electrical device can be calculated by using this formula:

Energy consumption = power × time

For the electric saw, we have:

• Power = 1.2 kW = 1.2 × 1000 = 1,200 Watts.

• Time = 20 minutes.

Substituting the given parameters into the formula, we have;

Energy consumption = 1,200 × 20

Energy consumption = 24,000 Joules.

For the electric sander, we have:

• Power = 1000 Watts.

• Time = half-hour = 30 minutes.

Substituting the given parameters into the formula, we have;

Energy consumption = 1,000 × 30

Energy consumption = 30,000 Joules.

Therefore, the electric sander (sanding) is the more expensive in terms of electricity used.

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