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Physics - Calculations with circuits
Calculations with circuits
This resource covers calculations with series and parallel circuits.
When two or more components are connected in a chain they are said to be
in series. You must be familiar with the properties of series circuits.
Since there is only one possible path for current to take, the current is
the same throughout the circuit. The voltage supplied must be completely
used by the circuit components therefore the supply voltage is equal to the
sum of the voltages across each load in the circuit. This is because any
coulomb of charge having passed through the battery must then pass through
every item in the circuit in turn, giving up some of its energy at each
load. It is logical therefore, that the total resistance of the circuit is
the sum of the resistance of each item in the circuit.
When batteries are connected in series, a coulomb of charge would pass
through one battery after another. The total voltage supplied to the
circuit therefore is the sum of the voltages of each individual battery.
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