Electricity

The active wire is live in the roof space between your power board (fuse box) and the power points in the walls. The telephone wire is live too but is at low voltage.

A macroshock will be noticed if the current is above 1 mA and the person is electrically connected simultaneously to the active wire and to the ground.

Two positive charges would repel each other. Two negative charges will repel each other. So “like” charges repel.

The fuse is on the active wire, so when it “blows” the wire has a gap in it.

The word “current” means flowing while “static” means not moving.

An electrocardiogram is the diagram (the graph) of voltage against time that is produced by a machine called an “electrocardiograph”.

Active (or live), neutral (or return) and earth.

The earth wire in an appliance with a metal case is connected to the inside of the case so that if a fault occurs that causes the metal case to be “live”, current can flow down the earth wire, rather than into your hand.

The earth wire will only carry current if the electrical device is faulty and the metal casing becomes live. It prevents a shock being received by anyone touching the device.

An electrocardiogram (ECG) is produced by an electrocardiograph machine.