Physics Test 0.0 / 5 ? PhysicsElectric CurrentASAQA Created by: blinkofaneye13Created on: 26-09-14 22:35 What is the equation for Power? Power (Watts, W) = Current (Amperes, A) x Voltage (Volts, V) 1 of 19 Why is a metal a good conductor? Has free electrons to carry charge. 2 of 19 What is the unit of charge? Charge is measured in coulombs (C) 3 of 19 What is the charge of an electron? negative = 1.6 x 10^-19 (e- = -1.6x10^-19C) 4 of 19 Describe charges in Insulators? You need to add or remove charges through friction. 5 of 19 Describe charge in a Fluid or Liquid? Charge carriers are the positive and negative ions. 6 of 19 What is current? The rate of flow of charge. 1A is equal to 1C passing through a single point in 1 second. 7 of 19 What is the equation for Charge? Charge (Q) = Current (I) x time (t) 8 of 19 Describe the current movement? Conventional current flows in the opposite direction to the electron movement. It flows positive to negative. 9 of 19 Describe the electron flow movement? It flows negative to positive. 10 of 19 Describe potential difference? The work done per unit of charge. 11 of 19 What is the equation for potential difference? p.d (Volts, v) = work done (Joules, J) / Charge (Coulombs, C) 12 of 19 What does E.M.F stand for? Electro motive force. 13 of 19 What is the definition of E.M.F? Electrical energy produced per unit charge passing a source. 14 of 19 What is the equation for work done? Work done = E.M.F x Charge or Work done = current x (delta) time x Voltage or Work done = Charge x Voltage 15 of 19 What are the units for resistivity? ohm m^-1 16 of 19 What are the units for resistance? Ohms 17 of 19 What is a micro meter? 1 x 10^-6m 18 of 19 What is the equation for resistivity of a wire? Resistance x Cross section area / length 19 of 19
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