Electrical and Potential Energy
Cells, batteries, generators all transfer energy to components in the circuit.
1) When an electrical charge goes through a change in voltage, energy is transferred.
2) Energy is given to the charge at the power source to raise it through a voltage.
3) The charge is given up when it passes through components in the circuit.
Electrical Energy = Voltage x Current x Time
Energy transfer is rarely 100% efficiant, there will almost always be wasted heat, noise energy etc.
Potential Energy = mass x g x height
'g' represents the 'acceleration of free fall', which on Earth, is always 10m/s²
The proper name for potential energy is gravitational potential energy.
Sometimes, the equation will be written as:
Change in potential energy = mass x g x change in height.
When something is raised from ground level, it has potential energy as it has potential to give off energy of some sort. Eg. a kettle on a table has the potential to give off heat and noise energy.
E.g, A sheep of mass 47kg is slowly raised through 6.3m. Find the gain in potential energy.
Answer: It's even easier than before, you just plug the numbers into the formula.
P.E = mgh = 47 x 10 x 6.3 = 2961J