Resistance Flashcards
(19 cards)
What is resistance?
Resistance is opposition to the flow of current.
What is the unit of resistance?
Ohms (Ω)
What is the symbol of resistance in an equation?
R
What does R stand for?
Resistance
What does I stand for?
Current
What does V stand for?
Voltage
Different ___________ have different levels of ____________.
Different materials have different levels of resistance.
What other store is the resisted energy normally transformed into?
Thermal energy
What is the triangle of Ohms Law?
V
————
I. x. R
How do you work out voltage?
V= IxR
How do you work out current?
I = V/R
How do you work out resistance?
R = V/I
What types of resistor are there?
. Fixed Resistor
. Variable Resistor
. Light dependant resistor
. Thermistor
The __________ the wire the ____________ the resistance.
The longer the wire the higher the resistance.
How do you work out the gradient?
Gradient = △y/△x
(Change in y divided by change in x)
On a graph with voltage on the y axis and current on the x axis what is the gradient?
Gradient = V/I
On a graph with voltage on the y axis and current on the x axis if it’s a steep line is the resistance high or low?
High
On a graph with current on the y axis and voltage on the x axis what is the gradient?
The reciprocal
Gradient = 1/R
On a graph with current on the y axis and voltage on the x axis if it’s a steep line is the resistance high or low?
Low
