A torch contains a cell, a switch and a lamp connected in a circuit.
The lamp only lights when the switch is closed.
State the two conditions needed for charge to flow in a circuit.
State what is meant by an electric current.
The current in the lamp is 0.30 A.
Use the equation: charge flow=current×time\text{charge flow} = \text{current} \times \text{time}charge flow=current×time
Calculate the charge that flows through the lamp in 50 s.
Give the unit.
43 exam-style questions on OCR GCSE Physics 3.1 Static and charge, covering 3.1.1 Positive and negative charge, 3.1.2 Static electricity and forces between charged objects, 3.1.3 Electron transfer and static electricity, 3.1.4 Electric fields, 3.1.5 Current as a flow of charge, 3.1.6 Current in a single closed loop, and 3.1.7 Charge, current and time. Each one has a worked solution and a mark scheme showing where the marks go.