A mobile phone charger is plugged into the mains supply.
The charger supplies a direct current to the battery of the phone.
Explain the difference between a direct potential difference and an alternating potential difference.
The output potential difference of the charger is 5.0 V.
The current in the charging cable is 2.0 A.
Calculate the power output of the charger.
The phone is charged for 45 minutes.
Calculate the energy transferred to the battery in this time.
Give the energy store of the battery that increases while it is being charged.
81 exam-style questions on Edexcel GCSE Physics 10.4 Mains electricity, covering 10.4.1 Direct and alternating current, 10.4.2 Live, neutral and earth wires; safety, 10.4.3 Mains wire potential differences and dangers, and 10.4.4 Power ratings and energy use. Each one has a worked solution and a mark scheme showing where the marks go.