Questions
1. Two resistors of 4 Ω and 6 Ω are connected in
series to a 20 V battery. Calculate:
(a) Equivalent resistance
(b) Current through the circuit
(c) Potential difference across each resistor.
2. Three resistors of 2 Ω, 3 Ω and 5 Ω are connected
in series with a 20 V supply. Find the total resistance,
current and power consumed by the circuit.
3. Two resistors of 6 Ω and 3 Ω are connected in
parallel across a 12 V battery. Calculate:
(a) Equivalent resistance
(b) Current through each resistor
(c) Total current supplied by the battery.
5. A heater has a resistance of 20 Ω and is connected
to a 220 V supply. Calculate:
(a) Current through the heater
(b) Power consumed
(c) Energy consumed in 2 hours.
6. Two resistors of 10 Ω and 20 Ω are connected in
series to a 60 V source. A student claims that both
resistors will consume equal power. Is the claim
correct? Calculate the power consumed by each
resistor.
7. Two appliances of 60 W and 100 W, both rated at
220 V, are connected in parallel to a 220 V supply.
Calculate the current drawn by each appliance and
the total current.
8. A 1.5 kW electric heater is used for 4 hours.
If electricity costs ₹7 per unit, calculate:
(a) Electrical energy consumed
(b) Cost of electricity.
9. A circuit contains three resistors of 3 Ω each.
They are first connected in series and then in
parallel across the same 18 V battery. Compare:
(a) Equivalent resistance
(b) Total current
(c) Total power consumed in both arrangements.