P4 Circuits Flashcards
Resistors in a series circuit…
all oppose the flow of electric current.
In a series circuit, how can the total resistance be calculated?
By adding up the resistance of each individual resistor.
How is total potential difference found in a series circuit?
By adding up the individual voltmeters’ voltages.
Equation for potential difference?
Potential Difference = Current x Resistance
How is the current in a parallel circuit?
The current is divided up along different branches then combines again when returning to the battery.
How is potential difference in a parallel circuit?
The PD across components connected in a parallel circuit is always equal.
What is resistance like in a parallel circuit?
The combined resistance of 2 resistors in parallel is less than either of the 2 resistors by themselves.
E.g. If a bucket of water has a hole in it, and another one is drilled, it does not matter how narrow the 2nd hole is (how high its resistance is), it is always faster for water to flow through 2 holes instead of 1.
Benefits of parallel circuits?
If one branch breaks, current still flows to the others.
Each branch can be switched on and off separately.
How does a series circuit have its components connected?
All on the same line as each other. Charge flows like water flows through a pipe. The current is the same at all points.
How does a parallel circuit have its components connected?
Components are connected in separate branches. The current is split between the branches.
