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Three heaters each rated 250 W, 100 V are connected in parallel to a 100 V supply of the energy supplied in kWh to the three heaters in 5 hours.
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A bulb is connected to a battery of p.d. 4 V and internal resistance 2.5 Ω . A steady current of 0.5 A flows through the circuit. Calculate:
The total energy supplied by the battery in 10 minutes
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A bulb is connected to a battery of p.d. 4 V and internal resistance 2.5 Ω . A steady current of 0.5 A flows through the circuit. Calculate:
The resistance of the bulb
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A bulb is connected to a battery of p.d. 4 V and internal resistance 2.5 Ω . A steady current of 0.5 A flows through the circuit. Calculate:
The energy dissipated in the bulb in 10 minutes.
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A battery of e.m.f. 15 V and internal resistance 2 Ω is connected to two resistors of resistances 4 ohm and 6 ohm joined (a) in series. Find in each case the electrical energy spent per minute in 6 Ω resistor.
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An electric kettle is rated 2.5 kW, 250 V. Find the cost of running the kettle for two hours at Rs. 5.40 per unit.
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A geyser is rated 1500 W, 250 V. This geyser is connected to 250 V mains. Calculate:
- The current drawn,
- The energy consumed in 50 hours, and
- The cost of energy consumed at ₹ 4.20 per kWh.
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What is the nature of current transmitted from the power station?
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The voltage of power generated at the generating stations is first stepped up before its transmission. Give reason.
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State the function of the following in a house circuiting of main fuse.
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State the function of the following in a house circuiting of main switch.
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State one advantage of using the main switch in house wiring.
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State the atomic number and mass number of \[\ce{^23_11Na}\] and draw its atomic model.
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Explain, why the potential difference across the terminals of a cell is more when the cell is not in use than it is when the cell is being used.
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How is direction of current related to the direction of flow of electrons?
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State expression for Cells connected in series.
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What is meant by internal resistance of a cell?
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State the condition when it is advantageous to connect cells in series.
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State the condition when it is advantageous to connect cells in parallel.
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How should the electric lamps in a building be connected?
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