Electricity

Some flashcards

What are Fuses?

Used to break if too much current flows through the circuit.

What are ammeters?

are used to measure current, connected in a series circuits.

What is Potential difference?

is equal to current multiples by resistance- V= IR.

What are Diodes?

They only allow current to flow in one direction which is why they only show a current when potential difference is positive.

What is a Battery

Made up of 2 or more cells, act in the same way as a cells, a filament lamp is a small light bulb.

What is a circuit

Closed loop with a power source and something for electrons to flow through.

What is Resistance?

Everything that resists or opposes the flow of electrons, measured in Ohms (?)

What are Voltmeters?

Used to measure potential difference, connected in parallel circuits.

What are Cells

Used to provide electric power.

How is flow of electricity controlled?

Switches

What are Filament Lamps?

Lamps that contain filament that heat up until it so hot that it emits light, which increases the resistance.

What are Light Emmitting Diodes?

Emit light when current flows through in a forward direction.

What is Potential Difference?

The force driving the flow of electrons, provided by cell /battery measured in Volts (V)

How is a Cell drawn?

Long line is the positive terminal, short line is the negative terminal.

What is the conventional current?

Electrons travel from Negative to positive terminal, however scientist originally thought it went from positive to negative

What is Q=It?

Charge equals current multipled by time