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(a) Define the term ‘coulomb’. (b) State the relationship between the electric current, the charge moving through a conductor and the time of flow. Calculate the charge passing through an electric bulb in 20 minutes if the value of current is 200 mA. |
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Answer» I = q/t t = 20 x 60 = 1200 seconds, I = 200 mA = 200 X 10-3 A I = 200 mA = 200 X 10-3A Charge passing = q = lt = 200 x 10-3 x 1200 = 240 C (a) When 1 A current flows across the wire in 1 second, the charge transfer across its ends is said to be 1 coulomb. (b) The relationship between the electric current I, the charge q and time t is |
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