A mobile phone is charged with a current of 1.5 A for 2.5 hours.
Calculate the charging time in seconds.
Calculate the charge that flows into the phone.
Use the equation
charge=current×time\text{charge} = \text{current} \times \text{time}charge=current×time
Give the unit.
Give your answer to (b) in standard form.
The charger has a potential difference of 5.0 V.
Calculate the energy transferred to the phone.
Use the equation
energy transferred=charge×potential difference\text{energy transferred} = \text{charge} \times \text{potential difference}energy transferred=charge×potential difference
Give your answer in kJ\text{kJ}kJ.
39 exam-style questions on Edexcel GCSE Physics 1.1 Units and quantities, covering 1.1.1 SI units for physical quantities and 1.1.2 Unit prefixes, conversions, significant figures and standard form. Each one has a worked solution and a mark scheme showing where the marks go.