Question

a)
8. An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the
(a) 100 W
(a) 1:2
(b) IR
trical power in a circuit?
(c) VI
(d) V2/R
power consumed will be -
(b) 75 W
(c) 50 W
4. Two conducting wires of the same material and of equal lengths and equal diameters
(d) 25 W
are first connected in series and then parallel in a circuit across the same potential
difference. The ratio of heat produced in series and parallel combinations would be-
(b) 2:1
(c) 1:4
(d) 4:1
5. How is a voltmeter connected in the circuit to measure the potential difference between
two points?
6. A copper wire has diameter 0.5 mm and resistivity of 1.6 x 10-812 m. What will be
the length of this wire to make its resistance 10 22? How much does the resistance
change if the diameter is doubled?
7. The values of current I flowing in a given resistor for the corresponding values of
potential difference Vacross the resistor are given below -
I (amperes) 0.5 1.0 2.0 3.0
4.0
V(volts) 1.6 3.4 6.7 10.2 13.2
Plot a graph between V and I and calculate the resistance of that resistor.
8. When a 12 V battery is connected across an unknown resistor, there is a current
of 2.5 mA in the circuit. Find the value of the resistance of the resistor.​

Answer 1

Answer:

Solution. R = 2202/100 Ω = 484 Ω. This is the resistance of the bulb. When V = 110 V, power consumed = V2/R = 1102/484 = 25 W.

Explanation:

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