Current and Voltage Explain the characteristics of current

measuring current Current is a measure of the rate of electric charge (Coulombs or

measuring current This is how we draw an ammeter in a circuit. A A

measuring current SERIES CIRCUIT • current is the same at all points in the

copy the following circuits and fill in the missing ammeter readings. 3 A ?

measuring voltage The ‘electrical push’ which the cell gives to the current is called

measuring voltage Different cells produce different voltages. The bigger the voltage supplied by the

measuring voltage This is how we draw a voltmeter in a circuit. V SERIES

series circuit • voltage is shared between the components • V 2 + V

parallel circuit • voltage is the same in all parts of the circuit. •

measuring current & voltage copy the following circuits on the next two slides. complete

measuring current & voltage a) 6 V 4 A A V V A

measuring current & voltage b) 4 A 6 V A V A

Slides: 15

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Current and Voltage Explain the characteristics of current in series and parallel circuits Explain the characteristics of voltage in series and parallel circuits

measuring current Current is a measure of the rate of electric charge (Coulombs or Q) or electron flow past a specific point in the circuit. Electric current is measured in amps (A) using an ammeter connected in series in the circuit. A

measuring current This is how we draw an ammeter in a circuit. A A SERIES CIRCUIT PARALLEL CIRCUIT

measuring current SERIES CIRCUIT • current is the same at all points in the circuit. I 1 = I 2 = I 3 = Total I I 1 = 2 I 3 = 2 I 2 = 2 PARALLEL CIRCUIT • current is shared between the components I 3 + I 4 = I 1/I 2 I 1 = 2 I 2 = 2 I 3 = 1 I 4 = 1

copy the following circuits and fill in the missing ammeter readings. 3 A ? 4 A ? 3 A 1 A ? 4 A ? 4 A 1 A 1 A ?

measuring voltage The ‘electrical push’ which the cell gives to the current is called the voltage. It is measured in volts (V) on a voltmeter. It is a measure of how much energy (E) is in each charge (Coulomb or Q) or electron. V

measuring voltage Different cells produce different voltages. The bigger the voltage supplied by the cell or battery, the bigger the current. Unlike an ammeter a voltmeter is connected across the components Scientist usually use the term Potential Difference (pd) when they talk about voltage.

measuring voltage This is how we draw a voltmeter in a circuit. V SERIES CIRCUIT V PARALLEL CIRCUIT

measuring voltage V V

series circuit • voltage is shared between the components • V 2 + V 3 = V 1 (Across cell) V 1 = 3 V V 2 = 1. 5 V V 3 = 1. 5 V

parallel circuit • voltage is the same in all parts of the circuit. • V 1 = V 2 = V 3 3 V 3 V 3 V

measuring current & voltage copy the following circuits on the next two slides. complete the missing current and voltage readings. remember the rules for current and voltage in series and parallel circuits.

measuring current & voltage a) 6 V 4 A A V V A

measuring current & voltage b) 4 A 6 V A V A

answers a) b) 4 A 6 V 4 A 4 A 3 V 6 V 4 A 6 V 2 A 3 V 4 A 6 V 2 A