Basic Electrics - Question 7

[Bob F]

Man A says circuit protection devices (e.g. fuses) are sensitive to current. Man B says they are sensitive only to voltage. Who is correct?

 

Man A only.

Man B only.

both Man A and Man B.

neither Man A nor Man B.

 

[Adam F]

I guessed A for the record Bob - soon as you thought my earlier on was a fluke!

[Barney]

Adam

 

If you had a fluke a would expext you to get all these questions right.

 

 

(Fluke is a good quality test instrument Manufacturer)

 

Mick

[Bob F]

If you'd have got this one wrong, Adam, after seeing the effects on those nice pink fuses today, I would have been very concerned for you.

 

Well done that man!

 

We'll make an electrician out of you yet.

 

BF

[Bob F]

A little bit of indicision on this one, with 3 different voting selections (by the way, I cannot see what you are individually voting).

 

The correct answer is current.

 

When current flows through a lamp filament or a cigarette lighter, heat and light are generated by changing electrical energy to thermal energy. The wire in a fuse melts from the heat generated when too much current flows.

 

You could have as high a voltage as you like (within reason), but the voltage itself would not melt the fuse. It is the current that produces the heat and melts the fuse.