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Filament Lamps

02 January 2012. I. Filament Lamps. Keywords Current (I), Amp, Voltage (V), Volts, ammeter, voltmeter, resistor, filament lamp, resistance (R), Ohm. Light bulb Facts

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Filament Lamps

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  1. 02 January 2012 I Filament Lamps Keywords Current (I), Amp, Voltage (V), Volts, ammeter, voltmeter, resistor, filament lamp, resistance (R), Ohm. Light bulb Facts Almost half of the electricity used by industry is for lighting. In homes, up to 25 percent of our electric bill is for lighting. Why do lightbulbs light in a microwave?

  2. OUTCOMES • All students should be able to describe that resistors will get hot. • Most students should be able to test circuits for current and potential difference and describe that the resistance of a filament bulb varies as the potential difference varies. • Some students should be able to explain why the resistance of a filament bulb varies as the potential difference varies.

  3. What causes resistance? Resistance is a measure of how much a material tries to stop electricity passing through it. Electricity is the flow of electrons along a wire. As the electrons move along the wire they collide with the metal ions in the wire. These collisions make the atoms vibrate more, which makes the metal hotter. All wires and components have some resistance, so electrical appliances always waste some energy as heat.

  4. Resistance simulation Student Demo

  5. Current-Potential Graph of a filament bulb • Set up the equipment as shown: • Vary the PD and take readings of current. • Analysis • Once you have a set of results draw a graph of Current on the y-axis and PD on the x-axis and write a conclusion. Results

  6. OUTCOMES Quiz • As current flows through a resistor what happens to its temperature? • Sketch a current voltage graph for a filament bulb. • Explain the shape of the graph you have sketched.

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