(a(i))[1]
Explain why the coils are wrapped around an iron core.
(a(ii))[2]
Suggest why thermal energy is produced in the core.
(b(i))[2]
State Faraday’s law for electromagnetic induction.
(b(ii))[2]
Use Faraday’s law to explain why the potential difference across the load and the supply e.m.f. are out of phase.
(c(i))[2]
Electrical energy is usually transmitted using alternating current. Suggest why the transmission is carried out using high voltages.
(c(ii))[1]
Electrical energy is usually transmitted using alternating current. Suggest why the transmission is carried out using alternating current.