Class
Key word for when resistor glows red - hot / increase in temperature: Power dissipated in resistor / energy transferred electrically to the internal store of resistor
Electric Heating and How Electricity Consumption in Measured
Electric Heating and How Electricity Consumption is Measured
Using Electrical Components Safely
Using Electrical Components Safety
Important
if 2 points have same electrical potential, then there is no p.d. between them
- voltage between them is 0
- no current flows through
Power is proportional to voltage. when voltage is doubled, power is doubled.
efficiency is 0 when the power output is 0
Sample
“110W, 240V lamp (power rating)
- with a voltage source / e.m.f source of 240V, 110J of energy is transferred electrically to internal store of lamp in 1 second
in other cases when there is no mention of voltage source → need to state: energy transferred from chemical potential store to internal store…