ohm's law Flashcards
What is ohm’s law?
The ratio of potential difference to current is a constant called resistance
What is potential difference?
Voltage (V)
What is current?
Ampere (I)
What is resistance?
Ohm (Ω)
How is voltage (V) calculated?
IR
How is current (I) calculated?
V/R
How is resistance (R) calculated?
V/I
What are non-ohmic electrical loads?
Electrical loads that do not obey ohm’s law => do not have constant resistance when they heat up
In a non-ohmic load, the current of a light bulb does not increase as much because?
Resistance increases as temperature increases
What are 4 factors that affect the resistance of wires?
- type of material
- length of wire
- thickness
- temperature
Longer or shorter wire has more resistance?
Longer
Does narrow wire have more or less resistance?`
More resistance
Does higher temperature have more or less resistance?
More– more particles moving around and blocking it