Calculate the (i) current flowing through it, An electric iron has a rating of 750 W, 220 V.
(a) Conventional direction of electric current is opposite to the direction of flow of electrons in a (b) Calculate the current in a circuit if 500 C of charge passes through it in 10 minutes. (a) How is the direction of electric current related to the direction of flow of electrons in a wire? (b) The relationship between the electric current I, the charge q and time t is (a) When 1 A current flows across the wire in 1 second, the charge transfer across its ends is said (b) State the relationship between the electric current, the charge moving through a conductor and the time of flow.Ĭalculate the charge passing through an electric bulb in 20 minutes if the value of current is 200 mA. Find the equivalent resistance of the combination. A 9Ω resistance is cut into three equal parts and connected in parallel.
(b) Potential difference, V = Work done on unit charge =W/q (a) When 1 joule of work is done in carrying 1 coulomb of charge, from infinity to a point in theĮlectric field, then potential at that point is called 1 volt. (b) State the relation between work, charge and potential difference for an electric circuit.Ĭalculate the potential difference between the two terminals of a battery if 100 J of work is required to transfer 20 C of charge from one terminal of the battery to the other. An arrangement for maintaining the continuous flow of electric current by the electricalĮnergy source through the various electrical components connected with each other by conducting wires is termed as electric circuit.Īn open circuit does not carry any current, while a closed circuit carries current. What is an electric circuit? Distinguish between an open and a closed circuit.Īnswer. So, new resistance is (1/16)th of original resistance. Length becomes one-fourth of the original length and area of cross-section By what factor does the resistance of the wire change?Īnswer. A given length of a wire is doubled on itself and this process is repeated once again. (d) For unidentical bulbs in parallel- different current, same potential difference. (c) For unidentical bulbs in series- same current, different potential difference. (b) For identical bulbs in parallel- same potential difference, different current. (a) For identical bulbs in series- same current, same potential difference. (d) different wattage are connected in parallel.Īnswer. (c) different wattage are connected in series.
(b) same wattage are connected in parallel. (a) same wattage are connected in series. Name the physical quantity which is (i) same (ii) different in all the bulbs when three bulbs of: What happens to resistance of a conductor when its area of cross-section is increased? How is an ammeter connected in a circuit to measure current flowing through it? In the electric field, then potential at that point is called 1 volt. When 1 joule of work is done in carrying 1 coulomb of charge, from infinity to a point Express it in terms of SI unit of work and charge calculate the amount of energy consumed in carrying a charge of 1 coulomb through a battery of 3 V.Īnswer. Name a device that helps to maintain a potential difference across a conductor. Extra Questions for Class 10 Science Chapter 12 Electricity