Electricity Flashcards
(16 cards)
What happens to the current when the potential difference across a component increases?
The current through it changes.
In a wire and a resistor, how is the current related to the potential difference?
The current is directly proportional to the potential difference.
What occurs with every increase of 1V in a wire or resistor?
It causes the same increase in current.
Describe the behavior of current in a filament lamp as the potential difference increases.
The current increases, but as the temperature increases, the resistance also increases.
What happens to the current in a filament lamp as resistance increases?
Each 1V increase causes smaller increases in current.
How does a diode behave as the potential difference increases?
The current stays close to 0A until around 0.6V, then increases significantly for small increases in potential difference.
What does an LDR do when light shines on it?
The resistance of a light-dependent resistor (LDR) decreases.
How can an LDR be used in a circuit?
It can act as a switch for turning on electric lights based on light levels.
What happens to the resistance of a thermistor when it gets hotter?
The resistance decreases.
How can a thermistor be utilized in electrical systems?
It can be used in an electrical thermostat.
What is an electric current in solid metallic conductors?
A flow of negatively charged electrons.
Define current in terms of charge flow.
Current is the rate of flow of charge.
What is the formula for charge moved?
Q = I × t.
What is potential difference?
The energy transferred per unit charge moved.
What is 1 volt equivalent to in terms of energy?
1 joule per coulomb.
What is the formula for energy transferred?
E = Q × V.
