Question

Consider the following circuit diagrams drawn by four students:



The correct circuit diagram for studying the dependence of current on the potential difference across the resistor is:
(1) A
(2) B
(3) C
(D) 4

Answer 1

An ammeter is always placed in series while the voltmeter is always connected in parallel to other electrical components in any circuit. Circuit B and D are totally wrong because of the positioning of voltmeter and ammeter. In circuit C, voltmeter and ammeter are connected at the right positions but the polarity of the voltmeter is wrong, hence circuit C is also wrong. In circuit A, both the voltmeter and ammeter are connected with the right polarities and at right positions.
Hence the correct answer is Option 1.