All wires used in electric circuits should be covered with:

1. Coloring material
2. Conducting material
3. an insulating material
4. none of the above

One kilowatt is equal to:

1. 100 watt
2. 1000 watt
3. 10 watt
4. none of these

Fuse wire is an alloy of:

1. tin-lead
2. copper-lead
3. tin-copper
4. lead-silver

A fuse wire should have:

1. a low melting point
2. high melting point
3. very high melting point
4. none of the above