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What we will do today: • Carry out experiments to investigate the following relationships: 1. Current in a parallel circuit 2. Voltage in a parallel circuit Current in a parallel circuit (don’t copy) • What is a parallel circuit? • What apparatus would be required to measure the current at different points in a parallel circuit? Current in a Parallel Circuit Point on circuit Value of Current (A) Is (supply current) I1 I2 • In a parallel circuit, the sum of the current across the components equals the supply • Is = I 1 + I 2 … Voltage in a parallel circuit • What apparatus would be required to measure the voltage at different points in a parallel circuit? Voltage in a Parallel Circuit Point on circuit Value of Voltage (V) Vs (supply voltage) V1 V2 • In a parallel circuit, the voltage across all components is the same as the supply. • Vs = V1 = V2 … What have we learned today? • In a parallel circuit, the sum of all the currents across the components is the same as the supply. • Is = I 1 + I 2… • In a parallel circuit, the sum of all the voltages is the same as the supply. • V s = V1 = V2 … Example 1 – find the missing values below • • • • Is = I1 + I2 0.6 = 0.2 + I2 I2 = 0.6-0.2 I2 = 0.4A • • • • Vs = V1 = V2 6V = 6V = 6V V1 = 6V V2 = 6V Example 2 – find the missing values below • Is = I1 + I2 + I3 • Is = 0.2 + 0.6 + 0.4 • Is = 1.2 A • Vs = V1 = V2 = V3 • V2 = 4V • So, Vs = 4V 2007 2010 2008 2007 2010 Qu: 22 2007 2009 2010 2007 Qu: 22 2004, Qu: 10 2006, Qu: 9