A machine has a power output of 0.080 MW0.080\ \mathrm{MW}0.080 MW. Its output is reduced by 15%. What is its new power output in watts?
9.2×104 W9.2\times10^4\ \mathrm{W}9.2×104 W
1.2×104 W1.2\times10^4\ \mathrm{W}1.2×104 W
6.8×104 W6.8\times10^4\ \mathrm{W}6.8×104 W
6.8×101 W6.8\times10^1\ \mathrm{W}6.8×101 W
39 exam-style questions on Edexcel GCSE Physics 1.1 Units and quantities, covering 1.1.1 SI units for physical quantities and 1.1.2 Unit prefixes, conversions, significant figures and standard form. Each one has a worked solution and a mark scheme showing where the marks go.