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What we will do today: • Carry out experiments to investigate the following relationships: 1. Current in a series circuit 2. Voltage in a series circuit Current in a series circuit (don’t copy) • What is a series circuit? • What apparatus would be required to measure the current at different points in a series circuit? Current in a series circuit Point on circuit Value of Current (A) Is (supply current) I1 I2 • In a series circuit, the current is the same at all points. • Is = I 1 = I 2 … Voltage in a series circuit (don’t copy) • What apparatus would be required to measure the voltage at different points in a series circuit? Voltage in a series circuit Point on circuit Value of Voltage (V) Vs (supply voltage) V1 V2 • In a series circuit, the sum of all the voltages is the same as the supply. • Vs = V1 + V2 … What have we learned today? • In a series circuit, the current is the same at all points. • Is = I1 = I2… • In a series 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 = 0.6A • Vs = V1 + V2 =2+2 Vs = 4V Example 2 – find the missing values below • Is = I1 = I2 = 0.6A • Vs = V1 + V2 =2+2 Vs = 4V 2003: 24(b) • (i) Vs = V1 + V2 … so 10 lamps get equal share of Vs. So 230 / 10 = 23 V • (ii) If one lamp breaks / goes out then all lamps go out.