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CURRENT, POTENTIAL DIFFERENCE and OHM’S LAW PART A: CURRENT I Q t 1) One _______________ is equal to one coulomb per second. 2) If 144 C of charge passes a point in a conductor in 3.0 min, what is the current through that point? 3) Find the current in a conductor when 24 C of charge pass a point in the conductor every 30 s. PART B: POTENTIAL DIFFERENCE V E Q 1) One _______________ is equal to one joule per coulomb. 2) If 42 J of chemical energy in a battery places 7.0 C of negative charge at the negative terminal, leaving a deficit at the positive terminal, what is the potential difference between the negative and positive terminals of the battery? 3) Find the potential difference between the terminals of a battery that uses 180 J of chemical energy to separate 20 C of charge. PART C: OHM’S LAW V IR 1) One _______________ is equal to one volt per ampere. 2) If a wall outlet provides a potential difference of 120 V and a current of 8.6 A through the heating coil in a toaster, what is the resistance of this heating coil? 3) Find the resistance of a light bulb if 2.4 A runs through it, when a potential difference of 12 V is placed across the light bulb. 4) Copy and complete the following table: V (potential difference) 120 V 6.0 V 4.0 V I (current) 12.5 A 6A 0.20 A 0.5 A 120 V R (resistance) 36 24 240 100 5) The resistance of a tungsten filament in a light bulb is 144 and a current of 0.833 A is flowing through it. What is the voltage drop across the light bulb? Part A: 1) ampere, 2) 0.8 A, 3) 0.8 A, Part B: 1) volt, 2) 6 V, 3) 9 V Part C: 1) ohm, 2) 14 , 3) 5, 4) 9.6 , 216 V, 0.25 A, 20 , 120 V, 1.2 A, 5) 120V