WS15.2 Safe Use of Electrical Components

The human body can only withstand a current of ___.

• 5 A

• 5 mA

• 0.005 A

• 0.005 mA

The hazard shown in the diagram represents ____. This exposes the dangerous ____ wires and can cause ____ when touched.

The diagram shows the electrical hazard ____ of cables. This happens when too many plugs are connected to socket and results in a ____ amount of ____ store.

The diagram shows the electrical hazard of ___ environment. Here, water usually contains charged ___, making it a ____ conductor of electricity.

The diagram shows a ___, which is a ___ device containing a strip of wire that will ___ when the current ___ a certain value.

Circuit breakers are similar to fuses because they prevent ___ ___ flow.

One key difference is that when the current exceeds a certain value, the fuse needs to be ___, while the circuit breaker can be ___ ___ again.

In the case when the outer casing of an appliance is made of metal, a safety protection of ____. the casing can be done. In this case, the live wire ___. through the metal casing and flows to the ___.

Appliances which have a plastic casing use ____ ____ . Here ____ the appliance is not needed.

In a three-pin plug, the ___ wire is connected to the fuse and carries ___ voltage. The ___ wire is kept at ___ voltage and completes the current return path. The ___ wire is a safety device connected to the metal case of the appliance.

Switches, fuses and circuit breakers must always be connected to the ___ wire. This is because when in use, the whole appliance is ___ from the high voltage and is not ___.