please solve these electricity mcq
Answers
Answer:
1. (c) (3rd graph) 2.(c) 3.(b)
Explanation:
1. The ammeter must be in series as it has negligible resistance, and the voltmeter must be in parallel with the circuit. And we must make sure that the positive side of the voltmeter is connected to the positive side of the battery and the negative side of the battery is connected to the negative side of the voltmeter, which is why the 4th circuit is wrong. Hence, (c)
2. Student 3 has tabulated the reading of voltmeter in a more accurate manner as the recordings are to 1 decimal place unlike others, hence, (c)
3. V = IR
(V/R) = I
This can be also written as
Vk = I, where k is the gradient.
Therefore V and I are directly proportional to each other and when it is plotted on a graph, it gives a straight line passing through the origin. And hence, the answer is (b)