Energy, Work and Power Flashcards
1
Q
Define energy, work & power
A
Work is the exertion of a force over a distance. Energy is the capacity to perform work. Power is the rate of work performed per unit time.
2
Q
For a given amount of electric current, which resistor will dissipate the greatest amount of power: a small value (low-resistance) resistor, or a high value (high-resistance) resistor?
A
A resistor with a high resistance rating (many “ohms” of resistance) will dissipate more heat power than a lower-valued resistor, given the same amount of electric current through it.
3
Q
The reason voltage polarities across a risistor and battery differ dispite the same direction of current through both is due to the flow of?
A
power
4
Q
Polarity of a source and a load are?
A
Opposite
