Electricity Flashcards
(23 cards)
Charged atoms are called ____.
ions
The resistance of a thermistor depends on its ___________.
temperature
At low temperatures, the thermistor has a ____ resistance.
high
At high temperatures, the thermistor has a ___ resistance.
low
What does LDR stand for?
Light-dependent resistor
At low light levels, the LDR has a ____ resistance.
high
At high light levels, the LDR has a ___ resistance.
low
What does a semi-conductor diode do?
allows current to flow in one direction only
What happens in a direct current?
The flow of electrons is constantly in one direction.
What happens in an alternating current?
The direction of electron flow continually reverses.
What is charge measured in?
coulombs (C)
To measure the current through a component, the ammeter must be placed in ______ with that component.
series
To measure the potential difference across a component, a voltmeter must be placed in ________ with that component.
parallel
What is resistance measured in?
ohms (Ω)
For the resistance vs wire length practical, what should the starting wire length be?
100cm
For the resistance vs wire length practical, what length should the wire decrease by each time?
10cm
For the p.d. vs current practical, what 3 pieces of apparatus do you use?
- Resistor.
- Bulb.
- Diode.
For the p.d. vs current practical, how much should you increase the p.d. by each time?
0.5V
For the p.d. vs current practical, what is the highest p.d. you should go to?
6.0V
For the p.d. vs current practical, how do you collect results for negative p.d.’s?
by reversing the power supply connections
For a fixed resistor, the p.d. is _________________ to the current.
directly proportional
For a filament bulb, the current ______________ the potential difference.
does not increase as fast as
For a diode, the current _____________ when the p.d. is negative.
does not flow
