P2 Electricity

How do objects get electrostatically charged?

How do objects get a negative or positive charge?

Rules for attraction and repulsion for electrostatic charge

Materials that charge can flow through

What is electric current?
How is it calculated?

What is potential difference?
How is it calculated?

How are thermistors used in circuits?

How are LDRs used in circuits?

What is a current-voltage graph?

The current–potential difference graph for a resistor at constant temperature.

How to measure the resistance of a component

How are current and voltage linked for a resistor (at constant temperature)?

Equation linking current, voltage and resistance

The effect of adding cells in series?

Patterns for series circuits
(Current, voltage, resistance)

Patterns for parallel circuits
(Current, voltage)

Voltage-current graph for a filament bulb?

How does resistance change for a filament bulb as the temperature of the filament increases?

Why does the resistance of a filament bulb increase as the temperature of the filament increases. (H)

Voltage-current graph for a diode?

Describe current flow in a diode

How does an LED work?

How does the resistance of an LDR vary?

How does the resistance of a thermistor vary?

What is dc?
What items supply it?

What is ac?

Candidates should be able to compare and calculate potential differences of d.c. supplies and the peak potential differences of a.c. supplies from diagrams of oscilloscope traces.

Higher Tier candidates should be able to determine the period and hence the frequency of a supply from diagrams of oscilloscope traces.

Mains electricity voltage and frequency?

The structure of electrical cable.

The structure and wiring of a three-pin plug.

What is a fuse or circuit breaker for?

How does a fuse work?

What is an RCCB?

What extra safety 'device' is used for metal-cased appliances?

What appliances do not need an earth wire?

Link between cable thickness and fuse value?

What does a flow of charge do to a resistor?

Link between power, energy and time?

Link between power, voltage and current (equation)?