SPM Questions: Section 2.1, Electricity

Section 2.1 : Analysing Electric fields & charge flows

1. Which graph shows the relationship between potential difference, V, and current, I, for a resistor that obeys Ohm’s law? (SPM03)

ans: A - Ohm's law will give a straight line graph

2. Which diagram shows the correct electric field pattern?(SPM03)

ans:B, lines of field shall move out from +ve charge.

3. Which circuit can be used to determine the resistance of a bulb? (SPM03)

ans: C, voltmeter should be connected in parallel across the bulb, Ammeter must be connected in series

4.The electric current supplied by a battery in a digital watch is 3.0 x 10 A.

What is the quantity of charge that flows in 2 hours? (SPM04)

A 2.5x107C
B 1.5x105C
C 6.OxlO5C
D 3.6x103C
E 2.2x10’C

ans: E, Q=I x t , t= 2 x60 =120s, then use the value of current & substitute it in the formula.

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