A student sets up a circuit to find the resistance of a piece of nichrome wire connected between two terminals, PPP and QQQ.
State: (i) whether the ammeter must be connected in series or in parallel with the nichrome wire to measure the current passing through it. (ii) whether the voltmeter must be connected in series or in parallel with the wire between terminals PPP and QQQ to measure the potential difference across it.
The student obtains the following readings:
Calculate the resistance of the nichrome wire. Show your working and include the unit in your final answer.
452 exam-style questions on CIE IGCSE Physics 4.2 Electrical quantities, covering 4.2.1a Positive and negative charge, 4.2.1b Charging by friction and detecting charge, 4.2.1c Electrical conductors and insulators, 4.2.1d Electric fields and electric field patterns, 4.2.2a Electric current, charge and measuring current, 4.2.2b Conduction in metals and the direction of current, 4.2.2c Direct current and alternating current, 4.2.3a Electromotive force, 4.2.3b Potential difference and voltmeters, 4.2.4a Resistance, 4.2.4b Resistance of a metallic wire, 4.2.4c Current–voltage graphs, and 4.2.5 Electrical energy and electrical power. Each one has a worked solution and a mark scheme showing where the marks go.