Cohesive adhesive force Cohesive adhesive force the force required hold things together.
Earth The conductive mass the earth.
. The symbol for efficiency the Greek letter ‘eta’ (η).
Electrotechnical industry The electrotechnical industry made variety individual compa-
nies, all providing service within their own specialism customer, cli-
ent user.
Centripetal force Centripetal force the force acting towards the centre when mass
attached string rotated circular path.Glossary terms
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Centrifugal force Centrifugal force the force acting away from the centre, the opposite to
centripetal force.
Electric shock Electric shock occurs when person becomes part the electrical circuit. The person who exercises ‘control over the whole
systems, equipment and conductors’ and the Electrical Company’s rep-
resentative on-site duty holder.
Efficiency any machine The ratio the output power the input power known the efficiency of
the machine.Whose electrical potential taken zero.
Duty holder Duty holder, this phrase recognizes the level responsibility which electri-
cians are expected take part their job order control elec-
trical safety the work environment. Everyone has duty care, but not
everyone duty holder.
Earthing The act connecting the exposed conductive parts installation to
the main protective earthing terminal the installation.
Conduit conduit tube, channel pipe which insulated conductors are
contained.
Compressive force Compressive force the force pushing things together. These electrons can easily become ‘free elec-
trons’ which allows heat and electricity pass easily through the material.
Compact fluorescent lamps (CFLs) CFLs are miniature fluorescent lamps designed replace ordinary GLS
lamps.
Conductor conductor material, usually metal, which the electrons are loosely
bound the central nucleus.
Delivery notes Delivery note used confirm that goods have been delivered the
supplier, who will then send out invoice requesting payment.
Corrosion The destruction metal chemical action.
Circuit protective conductor (CPC) protective conductor connecting exposed conductive parts equipment
to the main earthing terminal.
Electrical force Electrical force the force created electrical field.
Competent person competent person anyone who has the necessary technical skills,
training and expertise safely carry out the particular activity. general,
Power output
Power input
Electric current The drift electrons within conductor known electric current,
measured amperes and given the symbol I
