- The best instrument for the measurement of emf of a cell is
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- In a flash light three dry cells (emf 1.5 V each) are in series with a 1.5 ohm lamp. If each cell has an internal resistance of 0.25 ohm, the potential difference across the lamp will be
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- A battery whose emf is 45 volts is connected to a 20 ohm resistance and a electric current of 2.1 Amp flows. The terminal voltage is
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- A experimenter connects four 0.25 ohm cells in series but one cell is wrongly connected with its terminals reversed. The external resistance is 1 ohm. If the each cell has emf of 1.5 V, the electric current flowing is
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- When cells are connected in parallel grouping, then
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- For a voltage source when internal resistances R
_{s}, load resistance R_{l}, which of the following is maximum ?Under Construction - The capacity of storage battery is expressed as
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- Internal resistance of a battery is due to
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- Two cells are connected in series to form a battery . Their internal resistance is 0.1 ohm. The internal resistance of the battery will be
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- When n cells each of emf E volts and internal resistance r ohms are connected in parallel, the strength of the electric current i is given by
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- For a group of cells when internal resistance of group is equal to the external resistance due to load, the battery will give
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- A set of battery have terminal voltage of 1, 3, 5 and 7 volts. How many integer values of terminal voltages can be obtained by appropriate connection ?
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- Two battery , each having emf E, are connected in series. The combination is connected to an external variable resistor R. If the internal resistance of the battery is r
_{1}and r_{2}respectively, then the terminal voltage across the first cell (internal resistance r_{1}) will be zero whenUnder Construction - What is the arrangement to get the maximum electric current in 3Ω resistance in case of 24 cells, each of internal resistance 2Ω?
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- Four dry cells having emfs 1.50, 1.30, 1.35, 1.40 volts and resistances 0.3, 0.4, 0.2, 0.1 ohms, are connected in series to operate a relay having resistance of 10 ohms. The relay electric current is
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- A battery cell having an emf of 2.2 volts and an internal resistance of 0.03 Ω is connected to an external resistance of 0.10 Ω. The electric current drawn from the battery could be
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- In above problem, the power lost in battery was nearly
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- It has been found that internal resistance of a cell is comparable to external resistance. We wish to have maximum electric current through the external resistance. We should combine the cells in
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- A 45 V source with an internal resistance of 1.5 ohm is connected across a wire wound resistor. Maximum power will be dissipated on the resistor when its R is
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- A parallel connected battery of 1.5 V cells is to supply electric current to a 0.15 ohm resistor. If each cell can supply a maximum electric current of 1 A, determine the number of cell required
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