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Ohm’s Law V= Voltage (V) I = Current in amps (A) R = Resistance in ohm’s (Ω) For voltage use V= I x R For current use I = V / R For resistance use R = V / I You Try it! 3V is applied across a 6 Ω resistor, what is the current? Voltage = 3v Resistance = 6Ω I (current) = ? Formula is I = V/R I = 3V/6 Ω I = 3/6 = 0.5A A lamp connected to a 6V battery passes a current of 0.1 A, what is the lamp’s resistance? V=6v I=0.1A R =? R=V/I R = 6 / 0.1 R = 60 Ω A 1200 Ω resistor passes a current of 0.2 A, what is the voltage across it? R = 1200Ω I= 0.2A V=? V=IxR V = 0.2 x 1200 V = 240V