Current Electricity

Related Questions

• The electromotive force of a primary cell is 2 volts. When it is short-circuited it gives a current of 4 amperes. Its internal resistance in ohms is

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• Two wires of equal diameters, of resistivities ${\rho _1}$ and ${\rho _2}$ and lengths $l_1$ and $l_2$, respectively, are joined in series. The equivalent resistivity of the combination is

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• A galvanometer, having a resistance of 50 $\Omega$ gives a full scale deflection for a current of 0.05 A. The length in meter of a resistance wire of area of cross-section $2.97 \times 10^{–2} cm^2$ that can be used to convert the galvanometer into an ammeter which can read a maximum of 5 A current is (Specific resistance of the wire = $5 \times {10^{ - 7}} \Omega m$)

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• The equivalent resistance and potential difference between A and B for the circuit is respectively

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• Which of the following statement is correct

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