Electric Current And Its Effects

In an incandescent bulb, electric current passes through a very thin wire made of a special material. It is

• Alloy

• Tungsten

• Brass

• Plastic

Electric fuse works on the principle of __________ effect of current.

Several appliances which contain tightly wound coils, called _________ which heats up when an electric current is passed through it.

______________ is an automatically operated electric switch that protects an electric circuit during an overload or short circuit.

Which one of the following materials is used to make fuse wire.

• Lead

• Tin

• Aluminium and zinc

• All of these

A long wire that has been wound many times in a tight coil around a hollow or solid core and is also used as an electromagnet

• Solenoid

• Alnico

• Ferrite

• Samarium

A drawing of an electrical circuit with standard symbols is called as ____________ .

The strength of the electromagnets depend upon which of the following.

• A. The number of turns of wire

• B. The magnetic permeability of the material

• C. The amount of current passing through it

• Both A and C

• Both B And C

Which scientist is known for his discovery of the magnetic effect of electric current.

• Hans Christian Oersted

• Albert Einstein

• Isaac Newton

The unbroken path through which an electric current can flow is called as ______________ .