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Transcript

Ohm’s Law Engineering Science Page 1 Introduction Ohm’s Law is named after Georg Simon Ohm who was a German Physicist and Mathematician. He discovered an easy way to work out the Voltage, Current and Resistance of a circuit. It is his theory that we still use today. Page 2 The Formula The Formula that is used is V = I x R Using the formula allows you to work out the Voltage of a circuit if you know its Current and Resistance. From this formula we can also swap around the values to find Current (I) and Resistance (R) Page 3 The Triangle To remember all of the calculations, we can use a formula triangle This gives us a way to remember: V=IxR I=V/R R=V/I By covering up parts of the triangle, we are left with the calculation Page 4 Values Things that you need to remember are: Voltage is measured in Volts with the unit V (eg. 25V) Current is measured in Amps with the unit A (eg. 25A) Resistance is measured in Ohms with the unit Ω (eg. 25 Ω) Page 5 Example 1 What is the Voltage of the circuit? 270R 0.25A Page 6 Example 2 What is the Current of the circuit? 270R 5000V Page 7 Example 3 What is the Resistance of the circuit? 1.3A 200V Page 8