First of all we need a circuit… Equipment you need- What is the Voltmeter measuring? Energy in and energy out , for each coulomb passing through a component
Sorry Sir but I’m gonna’ have to search you… What have you got on you, Mr Coulomb?
Experiment- Investigating Voltage How does the voltage of a component in a series circuit compare to the voltage of a component in a parallel circuit? The following two circuits are set up and the voltage is measured across both 1.5 V batteries and across each 1.5V bulb individually.
Experiment- Investigating Voltage V 1 = V 2 = V 3 = V 4 = V 5 = V 6 = Series Parallel + V 1 Series + Parallel
In a series circuit the voltage supplied by the battery is divided between the components.
In a parallel circuit the voltage supplied is the same as the component’s voltage.
The energy each coulomb received (from the battery) is equal to the total energy given out as it goes round the circuit (conservation of energy).
Voltage in a series circuit V V V 2V If the voltage across the battery is 6V… … and these bulbs are all identical… … what will the voltage across each bulb be?
Voltage in a series circuit 4V V V If the voltage across the battery is 6V… … what will the voltage across two bulbs be?
Voltage in a parallel circuit 4V 4V If the voltage across the batteries is 4V… What is the voltage here? And here? V V
Summary In a PARALLEL circuit : Current SPLITS UP down each “strand” Voltage is THE SAME across each”strand” In a SERIES circuit: Current is THE SAME at any point Voltage SPLITS UP over each component
An example question: V 1 V 2 6 V 3 A A 1 A 2 V 3 A 3 What is the easiest path for the Coulombs of Charge? All bulbs are identical in power rating