New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Problems For Practice>Q 10

EASY

12th CBSE

IMPORTANT

Earn 100

In a house having $220 V$ line, the following appliances are working: (i) a $60 W$ bulb (ii) a $1000 W$ heater (iii) a $40 W$ radio. Calculate the current passing through the fuse line.

Important Questions on Current Electricity

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Problems For Practice>Q 10

In a house having

220 V

line, the following appliances are working : (iii) a

40 W

radio. Calculate the current drawn by heater

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Problems For Practice>Q 10

In a house having

220 V

line, the following appliances are working : (iii) a

40 W

radio. Calculate the current passing through the fuse line.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Problems For Practice>Q 11

Three equal resistances connected in series across a source of emf consume

20 W

. If the same resistances are connected in parallel across the same source of emf, what will be the power dissipated?

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Problems For Practice>Q 12

An electric heater consists of

20 m

length of manganin wire of

0.23 m^{2}

cross-sectional area. Calculate the wattage of the heater when a potential difference of

200 V

is applied across it. Resistivity of manganin

= 4.6 \times 10^{- 7} Ωm

.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Problems For Practice>Q 13

A line having a total resistance of

0.2 Ω

delivers

10 kW

at

220 V

to a small factory. Calculate the efficiency of the transmission.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Problems For Practice>Q 14

A motor operating on

120 V

draws a current of

2 A

. If the heat is developed in the motor at the rate of

9 cal s^{(- 1)}

, what is its efficiency?

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Problems For Practice>Q 15

A

500 W

electric heater is designed to work with a

200 V

line. If the voltage of the line drops to

160 V

, then what will be the percentage loss of the heat developed?

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Problems For Practice>Q 16

A

50 W

bulb is connected in a

200 V

line. Determine the current flowing in it and its resistance.