A cordless drill is powered by a battery.
The potential difference across the motor in the drill is 18 V.
The current in the motor is 4.0 A.
The drill is used for 90 s.
Calculate the energy transferred to the drill.
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
When it is fully charged, the battery can transfer 194 400 J194\,400\ \text{J}194400 J to the drill.
Calculate the maximum time that the drill can be used for.
Give your answer in minutes.
Describe the changes in energy stores that take place when the drill is used.
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.