A string of decorative lights has 20 identical lamps connected in a single closed loop.
The current in the first lamp in the string is 0.15 A.
A student says:
'The current is shared out between the 20 lamps, so each lamp has a smaller current than the first lamp.'
Explain why the student is wrong.
Calculate the charge that flows through each lamp in 1.0 hour.
One of the lamps breaks and leaves a gap in the circuit. All of the other lamps go out.
Explain why.
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.