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A 5 V battery with internal resistance 2 Ω and a 2 V battery with internal resistance 1 Ω are connected to a 10 Ω resistor as shown in the figure.

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 The current in the 10 Ω resistor is 

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Important Questions on Current Electricity

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Alpha Question Bank for Engineering: Physics>Chapter 24 - Current Electricity>Exercise - 3>Q 42
Two conductors have the same resistance at 0° C but their temperature coefficients of resistance are α1 and α2. The respective temperature coefficients of their series and parallel combinations are nearly
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Alpha Question Bank for Engineering: Physics>Chapter 24 - Current Electricity>Exercise - 3>Q 52
Two batteries with e.m.f 12V and 13V are connected in parallel across a load resistor of 10Ω. The internal resistance of the two batteries are 1Ω and 2Ω respectively. The voltage across the load lies between
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Alpha Question Bank for Engineering: Physics>Chapter 24 - Current Electricity>Exercise - 3>Q 53
In a potentiometer experiment, it is found that no current passes through the galvanometer when the terminals of the cell are connected across 52cm of the potentiometer wire. If the cell is shunted by resistance of 5 Ω, a balance is found when the cell is connected across 40 cm of the wire. Find the internal resistance of the cell.
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Alpha Question Bank for Engineering: Physics>Chapter 24 - Current Electricity>Exercise - 3>Q 54
On interchanging the resistances, the balance point of a meter bridge shifts to the left by 10 cm. The resistance of their series combination is 1KΩ. How much was the resistance on the left slot before interchanging the resistances ?
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Alpha Question Bank for Engineering: Physics>Chapter 24 - Current Electricity>Exercise - 4>Q 1
A galvanometer having 30 divisions has current sensitivity of 20 μA/div. It has a resistance of 25 ohm. How will you convert it to an ammeter measuring upto 1 ampere ? How will you now convert this ammeter into a voltmeter reading upto 1 volt ?
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Alpha Question Bank for Engineering: Physics>Chapter 24 - Current Electricity>Exercise - 4>Q 2

A D.C. supply of 120 volt is connected to a large resistance X. A volt meter of resistance 10 kΩ, placed in series in the circuit reads 4 volts. What is the value of X? What do you think is the purpose in using a voltmeter, instead of an ammeter, to determine the large resistance X?

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Alpha Question Bank for Engineering: Physics>Chapter 24 - Current Electricity>Exercise - 4>Q 3
A person decides to use his bath tub water to generate electric power to run a 40 watt bulb. The bath tub is located at a height of 10 m from the ground and it holds 200 liters of water. If we install a water driven wheel generator on the ground, at what rate should the water drain from the bath tub to light bulb? How long can we keep the bulb on, if the bath tub was full initially. The efficiency of generator is 90%. (g = 10m/s–2)
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Alpha Question Bank for Engineering: Physics>Chapter 24 - Current Electricity>Exercise - 4>Q 4

A cell of emf 3.4 volt and internal resistance 3Ω connected to an ammeter having resistance 2Ω and to an external resistance of 100Ω. When a voltmeter is connected across the 100 Ω resistance the ammeter reading is 0.04 ampere. Find the voltage read by the voltmeter and its resistance. Had the voltmeter been an ideal one, what would have been its reading.

(Approximate the answer to two decimal places)