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Ohm’s Law Review • What does V stand for? • What does voltage mean? • What does I stand for? • What does current mean? • What does Ω stand for? • What does resistance mean? Ohm’s Law • In 1827, Georg Ohm discovered that there was a relationship between voltage, current and resistance. • This is called Ohm’s Law: V=IxR Ohm’s Law 1) Can you calculate the current? (Don’t forget the units!) 2 Amps V=IxR Ohm’s Law Sarah is using a mystery battery. She measured the current to be 4 Amps. What is the voltage? 8V V=IxR Compare the Circuits using Ohm’s Law! V = I x R Compare the Circuits using Ohm’s Law! V = I x R Compare the Circuits using Ohm’s Law! V = I x R Compare the Circuits using Ohm’s Law! V = I x R Compare the Circuits using Ohm’s Law! V = I x R Compare the Circuits using Ohm’s Law! V = I x R Use Ohm’s Law! We found an unknown battery and we want to know the voltage! We measured the current to be 3 amperes (I = 3 A). Can you calculate the voltage using Ohm’s Law? V = I x R V = 3 * 2 V = 6 V
