Required practical: Resistance of a wire
A student investigates how the current through a filament lamp affects its resistance.
Which of the following components should be used in this investigation?
Light Dependant Resistor
Which of the following statements are correct steps in the method to carry out this investigation?
The ammeter is used to measure current
The voltmeter is used to measure potential difference
Resistance of the variable resistor is altered to change the current in the circuit
Resistance of the ammeter is altered to change the current in the circuit
In order to obtain a valid conclusion, the resistance is calculated for a large enough range of different currents.
Resistance is calculate by using the equation Resistance = Current x Voltage
What will happen to the resistance of the filament lamp as the current is increased?
There will be no change to the resistance of the filament lamp?
The resistance will increase because the temperature of the filament increases as the current increases and this increases the resistance.
The resistance will decrease because the temperature of the filament increases as the current increases and this lowers resistance.
The student decides to repeat the experiment using the same method and equipment. This is to check:
The accuracy of results
The validity of results
The repeatability of results
The reproducibility of results
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