National 5 Electricity Revision Flashcards
How does voltage behave in a series circuit?
Voltage is split across the components in a series circuit and will always be equal to the voltage of the source.
How does current behave in a parallel circuit?
Current splits across the branches of a parallel circuit.
How does voltage behave in a parallel circuit?
Voltage stays the same across a parallel circuit.
How would an ohmmeter be used to measure the resistance across a component?
It would be connected to the component in series without a power source.
How would an voltmeter be used to measure the voltage across a component?
It would be connected in parallel to the component which would be drawing power from an external source.
How would an ammeter be used to measure the current across a component?
It would be connected to the component in series. The component would draw power from an external source.
How does current behave in a series circuit?
Current stays the same throughout a series circuit
How is resistance measured in series?
Rt = R1 + R2 + R3 …
How is resistance measured in parallel?
1/Rt = 1/R1 +1/R2 + 1/R3 …
Define current
Current is a flow of electrons. “The rate of charge that flows per second”
How is charge calculated?
Q = It
Name a DC source and an AC source
DC: battery
AC: mains
Define potential difference
Known as voltage, potential difference is the energy that electrons require to flow around a circuit. “The energy per charge”
