EASY

12th CBSE

IMPORTANT

Earn 100

Three resistors $R_{1}$ , $R_{2}$ and $R_{3}$ each of $240 Ω$ are connected across a $120 V$ as shown in Fig. Find the total heat developed across the three resistors.

Important Questions on Current Electricity

MEDIUM

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Problems For Practice>Q 31

A heating coil is connected in series with a resistance

R

. The coil is dipped in a liquid of mass

2 kg

and specific heat

0.5 cal g^{- 1} ° C^{- 1}

. A potential difference of

200 V

is applied and the temperature of the liquid is found to increase by

60 ° C

20

minutes. If

R

is removed, the same rise in temperature is reached in

15

minutes. Find the value of

R

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Problems For Practice>Q 32

A series battery of

6

lead accumulators, each of emf

2.0 V

and internal resistance

0.25 Ω

is charged by a

230 V

d.c. mains. To limit the charging current, a series resistance of

53 Ω

is used in the charging circuit. What is (i) power supplied by the mains (ii) power dissipated as heat? Account for the difference in the two cases.

MEDIUM

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Problems For Practice>Q 32

A series battery of

6

lead accumulators, each of emf

2.0 V

and internal resistance

0.25 Ω

is charged by a

230 V

d.c. mains. To limit the charging current, a series resistance of

53 Ω

is used in the charging circuit. What is power dissipated as heat? Account for the difference in the two cases.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Problems For Practice>Q 33

A storage battery of emf

8 V

, internal resistance

1 Ω

, is being charged by a

120 V

d.c. source, using a

15 Ω

resistor in series in the circuit. Calculate the current in the circuit.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Problems For Practice>Q 33

A storage battery of emf

8 V

, internal resistance

1 Ω

, is being charged by a

120 V

d.c. source, using a

15 Ω

resistor in series in the circuit. Calculate the terminal voltage across the battery during charging.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Problems For Practice>Q 33

A storage battery of emf

8 V

, internal resistance

1 Ω

, is being charged by a

120 V

d.c. source, using a

15 Ω

resistor in series in the circuit. Calculate the chemical energy stored in the battery in

5

minutes.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Problems For Practice>Q 34

The following graph shows the variation of terminal potential difference $V$ , across a combination of three cells in series to a resistor, versus the current, $i$ : Calculate the emf of each cell

Question Image

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 3 - Current Electricity>Problems For Practice>Q 34

The following graph shows the variation of terminal potential difference $V$ , across a combination of three cells in series to a resistor, versus the current, $i$ : For what current $i$ , will the power dissipation of the circuit be maximum?

Question Image

Three resistors R1, R2 and R3 each of 240 Ω are connected across a 120 V as shown in Fig. Find the total heat developed across the three resistors.

Important Questions on Current Electricity

Learn and Prepare for any exam you want !

Three resistors $R_{1}$ , $R_{2}$ and $R_{3}$ each of $240 Ω$ are connected across a $120 V$ as shown in Fig. Find the total heat developed across the three resistors.