(a(i))[1]
State the meaning of ‘efficiency’.
(a(ii))[1]
Suggest why a filament lamp has a very low efficiency.
(b)[2]
Use this information, together with the data in Table 8.1, to determine the efficiency of the LED.
(c(i))[2]
Describe what happens next.
(c(ii))[2]
Explain why a person is not protected when the live wire touches the shiny metal surface.