Question

You are a scientist working on increasing the efficiency of appliances to waste less
electricity. You are running experiments measuring the input, output, and waste energy
from 3 light bulbs. Given the data below, determine which model has the lowest
percentage of energy lost as waste.
Lightbulb 1: 200 joules in, 50 joules wasted, 150 joules out
Lightbulb 2: 100 joules in, 30 joules wasted, 70 joules out
Lightbulb 3: 150 joules in, 100 joules wasted, 50 joules out

Answer 1

Lightbulb 1 has the lowest  percentage of energy lost as waste : 25%

Further explanation

Given

The input, output, and waste energy of Lightbulb

Required

The lowest  percentage of energy lost as waste.

Solution

Lightbulb 1 :

$\tt \%energy~lost=\dfrac{50}{200}\times 100\%=25\%$

Lightbulb 2 :

$\tt \%energy~lost=\dfrac{30}{100}\times 100\%=30\%$

Lightbulb 3:

$\tt \%energy~lost=\dfrac{100}{150}\times 100\%=66.7\%$

Answer 2

Answer: lightbulb 1: 200 joules in, 50 joules wasted, 150 joules out

Explanation: