Circuits

Open switch

Turns the circuit on so electrons can flow

Bulb

Creates light when current passes

Fuse

Breaks the circuit if too much current flows

Cell

Source of potential difference and pushes electrons

Voltmeter

Measures voltage across a component - always in parallel

Ammeter

Measures the current

Resistor

limits amount of current in a circuit

Variable resistor

Allows current in a circuit to be varied

Thermistor

Changes resistance based on temperature

LDR

Resistance and current flow depends on light intensity

Diode

Allows current to flow in 1 direction

LED

Emits light when current passes through in the correct direction

What direction does electron flow?

Negative terminal to positive terminal

What direction does conventional current go in?

Positive terminal to negative

What is voltage?

Difference in energy between two parts of a circuit

What is resistance?

Relationship between current and voltage

What is resistance formula?

Voltage = current x resistance

What is the relationship between voltage and current?

As voltage increases the current increases

What is the power equation?

Power = voltage x current

What is the equation for voltage?

Voltage = current x resistance

What us the equation for energy?

voltage x current x time

What is the equation for energy transferred?

Power in kilowatts x time in hours