Episode 9 — Electricity and Magnetism - Electric Circuits

Work, Power and Cost of Electricity

Learners will be able to:

• Identify the forms of energy that electrical potential energy is transformed into in a circuit. • Describe how the heating effect of an electric current occurs due to collisions between delocalised electrons and metal ions. • Calculate work done in a circuit using the equations: W = V x I, W = I^2 x R x T, and W = (V^2) / R. • Explain Joule's law and its relationship to the heating effect of an electric current. • Determine the factors that affect the heating effect of an electric current in a circuit. • Calculate power in a circuit using the equations: P = V x I, P = I^2 x R, and P = (V^2) / R.