Making Electricity

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Slide 1

Making Electricity

electrons.

Electricity passing along metal wires is a flow of

In a cell/battery, electricity comes from a chemical reaction

chemical energy

electrical energy.

Cells/batteries need replaced as the chemicals

are being used up in the reaction to supply electricity.

Some cells/batteries are rechargeable, e.g.

nicad cells (nickel-cadmium cells) and

the lead-acid battery used in cars/vans/buses.

Slide 2

Dry Cells

metal cap

zinc case

carbon rod

(graphite)

ammonium chloride

The ammonium chloride in the cell is an example of an

The purpose of the electrolyte is to

electrolyte.

complete the circuit.

Slide 3

Electricity can be produced by connecting different metals together (with an electrolyte) to form a

cell.

Different pairs of metals connected in a cell give different voltages. This enables us to construct an

electrochemical series (see data booklet - page 7)

Slide 4

Displacement reactions.

When a piece of magnesium metal is added to a solution of copper(II)sulphate, the blue colour of the solution fades and the magnesium is covered with a brown solid.

magnesium

copper(II)sulphate solution

Slide 5

Displacement reactions.

When a piece of magnesium metal is added to a solution of copper(II)sulphate, the blue colour of the solution fades and the magnesium is covered with a brown solid.

magnesium

copper(II)sulphate solution

Slide 6

Displacement reactions.

When a piece of magnesium metal is added to a solution of copper(II)sulphate, the blue colour of the solution fades and the magnesium is covered with a brown solid.

magnesium

copper(II)sulphate solution

Slide 7

Displacement reactions.

When a piece of magnesium metal is added to a solution of copper(II)sulphate, the blue colour of the solution fades and the magnesium is covered with a brown solid.

magnesium

copper(II)sulphate solution

Slide 8

Displacement reactions.

When a piece of magnesium metal is added to a solution of copper(II)sulphate, the blue colour of the solution fades and the magnesium is covered with a brown solid.

magnesium

copper(II)sulphate solution