Question

Use the data given to decide which water heater is more efficient. Show all relevant calculations to

support your choice.

Answer 1

Heater B

The efficiency = Energy output / Energy input.
This is because the efficiency is basically "how well can this thing use energy, will it waste a lot of energy or will most of the energy go towards
the use?"
The efficiency of A is:
Energy input = 7 * 10^3
Energy output = 4.5 * 10^3
4.5 * 10^3 / (7.0*10^3) = 0.642857143 = 64 %
The efficiency of B is:
Energy input = 5*10^4
Energy output = 3.3 * 10^4
3.3 * 10^4 / (5 * 10^4) = 0.66 = 66 %
The efficiency of B is greater, so heater B is more efficient by a little margin

Answer 2

Heater B

Step-by-step explanation:

The efficiency = Energy output / Energy input.
This is because the efficiency is basically "how well can this thing use energy, will it waste a lot of energy or will most of the energy go towards the use?"

The efficiency of A is:
Energy input = 7 * 10^3
Energy output = 4.5 * 10^3
4.5 * 10^3 / (7.0*10^3) = 0.642857143 = 64 %

The efficiency of B is:

Energy input = 5*10^4
Energy output = 3.3 * 10^4
3.3 * 10^4 / (5 * 10^4) = 0.66 = 66 %

The efficiency of B is greater, so heater B is more efficient by a little margin