# Magnetism and electricity: Identify, describe and apply properties of electricity in an electric circuit

### Subject outcome

Subject outcome 4.3: Identify, describe and apply properties of electricity in an electric circuit).

### Learning outcomes

- Define and calculate electrical current.
- Differentiate between the two types of current (AC and DC).
- Describe and identify resistance in terms of length, cross-sectional area and type of material.
- Determine and describe the relationship between load (total resistance) and current.
- Define electrical potential difference (voltage) and emf and give examples of sources.
- Determine potential charge when cells are grouped and potential division in a series circuit.
- Describe the reason for electrical safety and earthing.

### Unit 1 outcomes

By the end of this unit you will be able to:

- Define electrical current.
- Calculate electrical current.
- Differentiate between the two types of current, namely alternating current (AC) and direct current (DC).

### Unit 2 outcomes

By the end of this unit you will be able to:

- Describe resistance in an electric circuit.
- Describe how the following properties of a conducting material affect resistance:
- length
- cross-sectional area
- type of material.

- Determine the relationship between load (total resistance} and current, and describe the general principle.

### Unit 3 outcomes

By the end of this unit you will be able to:

- Define electrical potential difference (voltage) and emf.
- Give examples of sources of potential difference and emf.
- Determine potential change when cells are grouped.
- Determine potential division in a series circuit.

### Unit 4 outcomes

By the end of this unit you will be able to:

- Describe the reason for electrical safety and earthing.