Motor Presence
Motors produce movement. If a motor is present you
should hear a whirring sound. SAFETY -Never dismantle any electrical
appliance!
Heat Production
Heat is always produced in machines, whether it is wanted or not!
It Is pretty easy to decide whether heat is produced by design (eg
the immersion heater is designed to heat water) but it is not so easy
to see whether heat is produced as a by-product.
You will probably need to have the appliance switched on for a while
before you can find this out, or ask someone who uses it a lot.
Be careful you don't burn yourself. (You could indicate how much heat
is produced in the column provided).
Does an appliance that produces heat by design, also produce some by-product
heat? (i.e. heat where it is not made use of ~ wasted heat).
Look to see whether there is some feature of the machine to cut down
by-product heat loss or some feature to facilitate the dispersion of
by-product heat loss (e.g. fins).
Power Classification
We are going to classify appliances as high, medium or low power by
the type of fuse they need.
Low powered appliances only need a 3A (3 amp) fuse. They have power
ratings of 720 W (720 watts) or less.
Medium powered appliances require a 5 A (5 amp) fuse (although a 13A
fuse is often fitted). They have power ratings of between 720 W and
1200 W (1.2 kilowatts - 1.2 kW).
High powered appliances must have a 13A (13 amp) fuse fitted. They
have power ratings of up to 3.2 kW.
Questions
- Look carefully at the appliances you have classified as high power.
Study the columns that you have ticked for each one. Can you see any
pattern?
- Look carefully at the appliances you have classified as low power.
Study the columns that you have ticked for each one. Can you see any
pattern?