A portable tyre inflator is supplied by a rechargeable battery.
While the inflator is working, the potential difference across its motor is 12 V and the current in the motor is 8.0 A.
On one charge, 115 200 J115\,200\ \text{J}115200 J is available for transfer to the motor.
Calculate the running time of the tyre inflator before this amount of energy has been transferred.
Give your answer in minutes.
Use the equation
energy transferred=current×potential difference×time\text{energy transferred}=\text{current}\times\text{potential difference}\times\text{time}energy transferred=current×potential difference×time
105 exam-style questions on Edexcel GCSE Physics 10.3 Electrical energy and power, covering 10.3.1 The heating effect of an electric current, 10.3.2 Reducing energy transfer in wires, 10.3.3 Advantages and disadvantages of the heating effect, 10.3.4 Energy transferred by an electrical circuit, 10.3.5 Electrical power, and 10.3.6 Energy transfers in domestic devices. Each one has a worked solution and a mark scheme showing where the marks go.