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One coulomb charge is equivalent to the charge contained in:
(a) 2.6 × 1019 electrons
(b) 6.2 × 1019 electrons
(c) 2.65 × 1018 electrons
(d) 6.25 × 1018 electrons
Why should the resistance of:
an ammeter be very small?
An electric bulb of resistance 20 Ω and a resistance wire of 4 Ω are connected in series with a 6 V battery.
Draw the circuit diagram, and calculate:
(a) total resistance of the circuit.
(b) current through the circuit.
(c) potential difference across the electric bulb.
(d) potential difference across the resistance wire.
State three factors on which the heat produced by an electric current depends. How does it depend on these factors?
Calculate the effective resistance between the points A and B in the network shown below in Figure 8.45
An electric iron is rated 750 W, 230 V. Calculate the electrical energy consumed by the press in 16 hours.
Study the following circuit and find out:
(i) Current in 12 Ω resistor.
(ii) The difference in the readings of A1 and A2, if any.
