Series and Parallel Circuits

+ the basics

Describe a series circuit.

Closed circuit

Current is the same

P.d is shared

Resistance is the sum of all the resistors

Describe a parallel circuit

Branched circuit

current is shared (sum of all)

pd is the same

total resistance is less than the smallest resistor

ex - 1/r

What is current?

Flow of electrical charge

What is the equation linking charge, current and time?

Charge = current x time

What happens if you increase the flow of charge?

The current increases also.

What two component’s is current dependant on?

The resistance and potential difference across the component.

If you lower the resistance…

the current increases

What is resistance?

A component that opposes current.

What is ohms law?

If the resistance is constant, current and pd are directly proportional to each other.

What is the equation for ohms law?

V = IR (pd = current x resistance)

What is the relationship between LDR and resistance?

If you increase the light intensity, resistance decreases.

and vice versa.

What is the connection between thermistor and resistance?

If you increase the temperature, the resistance decreases.