Power Flashcards
1
Q
What is power, its formula and unit?
A
Power is energy change over time, P = Echange/t where power is in watts and E is in Kj.
2
Q
What is power in terms of voltage and current?
A
P = IV
3
Q
What are the alternate power formulas?
A
P = I^2 R or P = V^2 / R
4
Q
What is power directly related to?
A
Brightness.
5
Q
What happens to the brightness of bulbs when moved from series to parallel?
A
The parallel combination of resistors reduces the effective resistance of the circuit. Assuming V in V=IR is constant, as R value reduces, I, current increases increases at the same rate (inversely proportional). And since P=IV, The power (brightness) going to the bulbs will be brighter in parallel.
