Using Ohm's Law V=IR - GCSE Physics

Here's a quick electricity demonstration. Ohm's law states that Voltage = Current x Resistance We can use this to find the resistance of a light bulb in a series circuit. Using an ammeter connected in series, we obtain a reading for current. Using a voltmeter in parallel with the bulb, we obtain a reading for voltage. (Note that a bulb is non-ohmic, but we can still use this equation for bulbs in GCSE questions by assuming constant temperature.) Further info: In words, Ohm's Law means that, for a constant temperature, voltage is proportional to current and the resistance remains constant. An extension of the demonstration in this video would be to measure a range of current going through the bulb by varying the voltage supplied. Plotting an I-V characteristic graph will show that a bulb is non-ohmic! However, in GCSE, you will often come across exam-style questions that permits the use of Ohm's law equation with bulbs. Music credit: Song: Dipcrusher - Islands (Vlog No Copyright Music) Music provided by Vlog No Copyright Music. Video Link: /watch/�4tIz3qenFpCn3 ��

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