Series Circuits

In series circuits, the different components are

**connected**in a line, end to end, between the +ve and -ve of the power supply(except for voltmeters, which are always connected in parallel, but they don’t count as part of the circuit).If you remove or disconnect one component, the circuit is

**broken**and they all stop. This is generally not very handy, and in practice very**few**things are connected in seriesYou can use the following rules to design series circuits to measure quantities and test components

In series circuits the total pd of the supply is shared between the various components. So the potential difference round a series circuit always **add** up to **equal** the **source** pd:

V(total) = V1 + V2 +…

In series circuits the **same** current **flows** through **all** components: R(total) = R1 + R2

The size of the current is determined by the total pd of the cells and the total resistance of the circuit

I = V / R

In series circuits the total resistance of **two components** is just the sum of their resistance. This is because by adding a resistor in series, the two resistors have to **share** the total pd. The potential difference across each resistor is **lower**, so the current through each resistor is also lower. In a series circuit, the current is the same **everywhere** so the total current in the circuit is reduced when a resistor is added. This means the total resistance of the circuit **increases**. The bigger a component’s resistance, the bigger its **share** of the total potential difference

There is a **bigger** pd when more cells are in series, if they’re all **connected** the same way. For example when two cells with a **potential difference** of 1.5V are connected in series they supply 3V between them.

In series circuits, the different components are

**connected**in a line, end to end, between the +ve and -ve of the power supply(except for voltmeters, which are always connected in parallel, but they don’t count as part of the circuit).If you remove or disconnect one component, the circuit is

**broken**and they all stop. This is generally not very handy, and in practice very**few**things are connected in seriesYou can use the following rules to design series circuits to measure quantities and test components

In series circuits the total pd of the supply is shared between the various components. So the potential difference round a series circuit always **add** up to **equal** the **source** pd:

V(total) = V1 + V2 +…

In series circuits the **same** current **flows** through **all** components: R(total) = R1 + R2

The size of the current is determined by the total pd of the cells and the total resistance of the circuit

I = V / R

In series circuits the total resistance of **two components** is just the sum of their resistance. This is because by adding a resistor in series, the two resistors have to **share** the total pd. The potential difference across each resistor is **lower**, so the current through each resistor is also lower. In a series circuit, the current is the same **everywhere** so the total current in the circuit is reduced when a resistor is added. This means the total resistance of the circuit **increases**. The bigger a component’s resistance, the bigger its **share** of the total potential difference

There is a **bigger** pd when more cells are in series, if they’re all **connected** the same way. For example when two cells with a **potential difference** of 1.5V are connected in series they supply 3V between them.