7 j electrical circuits (whs)
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Electrical CircuitsElectrical Circuits
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Drawing CircuitsDrawing Circuits
1) A cell, a bulb and a switch “in series”
2) A battery of cells, a switch and two bulbs in series
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Measuring electric currentMeasuring electric currentWe can measure the amount of electric current flowing through a circuit using a device called an “ammeter”.
A
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Current in a series circuitCurrent in a series circuit
If the current here is 2 amps…
The current here will be…
The current here will be…
And the current here will be…
In other words, the current in a series circuit is THE SAME at any
point
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Changing the currentChanging the current
If a battery is added the current will ________ because there is a greater _____ on the electrons
If a bulb is added the current will _______ because there is greater ________ in the circuit
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Parallel circuitsParallel circuitsA parallel circuit is one where the current has a “choice of routes”:
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Current in a parallel circuitCurrent in a parallel circuit
A PARALLEL circuit is one where the current has a “choice of routes”
Here comes the current…
And the rest will go down here…
Half of the current will go down here (assuming the bulbs are the same)…
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Current in a parallel circuitCurrent in a parallel circuit
If the current here is 6 amps
The current here will be…
The current here will be…
The current here will be…
And the current here will be…
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Advantages of parallel circuits…Advantages of parallel circuits…
There are two main reasons why parallel circuits are used more commonly than series circuits:
1) Extra appliances (like bulbs) can be added without affecting the output of the others
2) If one appliance breaks it won’t affect the others either
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FusesFuses
Fuses are _______ devices. If there is a fault in an appliance which causes the ____ and neutral (or earth) wire to cross then a ______ current will flow through the _____ and cause it to _____. This will break the _______ and protect the appliance and user from further _____.
Words – large, harm, safety, melt, live, circuit, fuse