10.4.4 Power ratings and energy use

Describe, with examples, the relationship between the power ratings for domestic electrical appliances and the changes in stored energy when they are in use Use of mathematics Make calculations using ratios and proportional reasoning to convert units ● rates (1c, 3c). Apply the equations relating p.d., current, quantity of charge, resistance, ● and time, and solve problems for circuits which include resistors in series, concept of equivalent resistance (1c, 3b, 3c, 3d). Use graphs to explore whether circuit elements are linear or non-linear ● curves produced to their function and properties (4c, 4d). Make calculations of the energy changes associated with changes in a ● selecting the relevant equations for mechanical, electrical, and thermal express in quantitative form and on a common scale the overall redistribution the system (1a, 1c, 3c). Suggested practicals Investigate the power consumption of low-voltage electrical items. ●.