Current, charge and potential difference 0.0 / 5 ? PhysicsD.C. ElectricityASOCR Created by: LeahhJaneeCreated on: 05-12-16 13:57 Describe in words and symbols how current and charge are related. Q = It. Current is the rate of flow of charge. 1 of 6 Explain what is meant by the sentence 'charge is quantised'. It will always be a multiple of e (the elementary charge). 2 of 6 Define potential difference. The work done per unit charge. V = W/Q. 3 of 6 Write an equation for the velocity of an electron accelerated by a p.d. of V, in terms of its charge and mass. v^2 = 2eV/m (as eV equals kinetic energy). 4 of 6 What happens to the current in a wire if the mean drift velocity of the electrons is halved? It is halved. 5 of 6 Describe how metals, semiconductors and insulators differ in terms of n. Metals have a high n value, semiconductors have a lower n value and insulators have an n value close to zero. 6 of 6
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