chapter 19 practical electricity Flashcards
1
Q
why is nichrome used as a heating element?
A
it has high resisitivity and can withstand high temperatures
2
Q
formulas to calculate power
A
P = E/t, P = VI, P = I^2R, P = V^2/R
3
Q
what does a power rating of 240V, 2kW mean?
A
when appliance is connected to 240V of working voltage, it dissipate in 2kJ of thermal energy in 1 second
4
Q
what is 1 kWh?
A
(1x10^3W) x (60x60)s = 3.6 x 10^6 J or 3.6MJ
5
Q
what are renewable sources of energy?
A
sources of energy that can be replenished naturally eg wind, solar
6
Q
what are non renewable sources of energy?
A
