Physics Electrical Quantities

What is electrical current related to?

The flow of charge

What is electric current?

Electric current is the charge passing a point per unit time

Current equation

I (A) = Charge(Coulombs)/time (s)

What direction does conventional current go?

Positive to negative

What direction do free electrons travel?

Negative to positive

What is electromotive force and what is it measured in?

Electromotive force is the electrical work done by a source in a moving unit charge around a complete circuit. Measured in volts (V)

What is potential difference and whats it measured in?

Potential difference is the work done by a unit charge passing through a component. Measured in volts (V)

What is the equation of potential difference or E.M.F (Basically voltage)?

Voltage (v) = Work done (J)/Charge (Coulombs)

Equation for power?

Power = Current x Voltage or Current squared x resistance

Equation for energy?

Energy = Voltage x Current x time

How to go from kilowatt-hour to joules and vice versa?

kWh x (3.6 × 10⁶) = J J ÷ (3.6 × 10⁶) = kWh

Resistance equation

Resistance = Voltage/Current

If a component is smaller, what kind of resistance would it have and what does this do to the voltage?

A larger resistance as it is smaller, so the component would take a larger proportion of the voltage