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An investigation into the characteristics of a filament bulb

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Planning This experiment is an investigation into the characteristics of a filament bulb. I will use a voltmeter in parallel around a filament bulb and measure the values when different volts are passed through the circuits. I will also use an ammeter in series with the filament lamp and measure the currents found under the different voltages. I will set the apparatus as follows Apparatus: Voltmeter Ammeter Wires Power supply Variable resistor Filament Bulb I will set the voltage at the certain voltages and I will repeat the experiment twice. ...read more.


I must not leave my wires dangling as this is a safety hazard. I must try and work away from other experiments as this will give me more space to work on and minimise hazards to the other experimenters in the room. I would predict that as the voltage goes up so do the readings on the ammeter and voltmeter. There will be a positive strong line on a line graph that would rise rapidly but as the voltage is increased, the curve will flatten out. ...read more.


This can be controlled to a certain extent by performing the experiment all at the same time when the temperature changes will be very slight. Volts Test 1 Test 1 Test 2 Test 3 Ammeter Voltmeter Ammeter Voltmeter 1 Volt 0.63 1.02 0.97 0.99 2 Volts 0.83 2.00 1.31 1.95 3 Volts 1.00 3.01 1.64 2.99 4 Volts 1.15 4.00 1.87 4.00 5 Volts 1.25 5.00 2.12 5.02 6 Volts 1.43 6.02 2.32 5.95 7 Volts 1.52 6.99 2.54 7.05 8 Volts 1.64 8.08 2.65 8.01 9 Volts 1.66 9.01 2.80 8.99 10 Volts 1.80 10.05 3.07 9.92 ...read more.

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