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# Electricity PowerPoint PPT Presentation

Electricity. Current Voltage Resistance Current, Voltage, Resistance characteristics AC DC Plugs Earth Fuses Power. Current. Current is the amount of charge flowing past a point in a given time Current (A) = Charge (C) / time (s) Current read by an ammeter – connected in series.

Electricity

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## Electricity

Current

Voltage

Resistance

Current, Voltage, Resistance characteristics

AC DC

Plugs

Earth

Fuses

Power

### Current

• Current is the amount of charge flowing past a point in a given time

Current (A) = Charge (C) / time (s)

Current read by an ammeter –

connected in series

### Potential Difference

• Voltage

• Potential difference is the energy given to or given by a charge when it passes a component.

PD (V) = Energy (J) / Charge (C)

PD is taken by a voltmeter and is connected in parallel with the component.

### Resistance

• Resistance is the volts per amp for a component.

• How many volts are needed to push a current of so many through a component.

Resistance (Ohms) = PD (V)/ Current (A)

• Circuit models

• Circuit diagrams

• Resistor models

• Resistor

• Bulb

• Diode

• Thermistor

• LDR

• review

### Mains Elec

• PHET

• AC DC

• Period and frequency

### Fuse

• A Fuse is a piece of wire with a low melting point

• If there is a fault in the electrical appliance and the current goes up it could damage the wiring in the appliance

• But if a fuse is installed, this will melt (or “blow”) and break the circuit

• So a fuse is used to protect the appliance – not necessarily to protect us from electric shock

### Earth

• What on Earth does it do?

• V d G

### Earth

• No Earth – No Fault

### Earth

• No Earth - Fault

### Earth

• Earth – no Fault

### Earth

• Earth - Fault

### Power

• Power = work done / time taken

• Lifting stuff

### Electrical Power

• Electrical power is the electrical work done in a given time.

Power (W) = current (A) x voltage (V)