A student connects a cell, a switch, a lamp and a resistor in a single closed loop.
She uses four ammeters, W, X, Y and Z, to measure the current at four different points in the loop.
The Table shows the readings on three of the ammeters.
Table
| Ammeter | Reading in A\text{A}A |
|---|---|
| W | 0.24 |
| X | 0.24 |
| Z | 0.24 |
Ammeter Y is connected between the lamp and the resistor.
State the reading on ammeter Y. Give a reason for your answer.
Another student says:
'The lamp uses up some of the current, so the current after the lamp should be smaller.'
Explain why the student is wrong.
The student opens the switch.
State the reading on ammeter W. Explain your answer.
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.