EASY
12th CBSE
IMPORTANT
Earn 100

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.

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Important Questions on Current Electricity

MEDIUM
12th CBSE
IMPORTANT
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 in 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
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
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
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
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
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

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

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EASY
12th CBSE
IMPORTANT

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?

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