Question

3. How much charge flows through a wire in 10
minutes if the current through it is 2.5 A?
4. A 2-V cell is connected to a 1-2 resistor. How many
electrons come out of the negative terminal of the
cell in 2 minutes?
5. The amount of charge passing through a cell in 4
seconds is 12 C. What is the current supplied by the
cell?
6. A 6-V battery is connected across a 50 resistor.
Calculate the current passing through the resistor
7. When a 24-V battery is connected to a resistor, the
current in it is 0.4 A. What is the resistance of the
resistor? What would be the current through it when
it is connected to a battery of 6 V?
8. In an experiment, the current flowing through a
resistor and the potential difference across it are
measured. The values are given below. Show that
these values confirm Ohm's law, and find the
resistance of the resistor.
1 (ampere) 10 15 20 25 30
V (volt) 4.0 6.0 80 100 12
9. The resitivity of copper is 1.7x10 m (a) What
length of copper wire of diameter 0.1 mm will have a
resistance of 34 27 (b) Another copper wire of the
same length but of half the diameter as the first is
taken. What is the ratio of its resistance to that of the
first wire?
10. Three resistors, each of resistance 12 A. are
connected in parallel. What is the equivalent
resistance?
11. A uniform wire of resistance R is cut into two equal
pieces, and these pieces are joined in parallel. What
is the resistance of the combination?
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Answer 1

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