Circuit Flashcards
1
Q
What is the role of an ‘Ammeter’ in a circuit?
A
- To measure the current flowing through the component
2
Q
Where must the ammeter be placed in a circuit?
A
- In a series, so it is connected in a line with the component
3
Q
What is the role of the ‘Voltmeter’ in a circuit?
A
- To measure the voltage or potential difference across the component
4
Q
Where must the voltmeter be in a circuit?
A
- It must be placed in parallel around the component under test
5
Q
What happens as the variable resistor is varied?
A
- It alters the current flowing through the circuit
6
Q
What are ‘Fixed Resistors’?
A
- The current through a resistor at constant temperature is proportional to voltage
7
Q
What is the difference between different resistors?
A
- They have different resistances, hence the different slopes (graph)
8
Q
What takes place with a filament lamp?
A
- As the temperature of filament lamp increases, the resistance increases, hence the current
9
Q
What happens with a diode?
A
- The current will only flow through a diode in one direction
