VII. Very short answer
1. What is the speed of electric current?
2. What is the S.I unit of electrical conductivity?
3. Name the device used to generate electricity.
4. Define fuse.
5. Name some devices that run using heat
effect of electric current
6. Name few insulators.
7. What is a battery? answer
Answers
Explanation:
Q 1 It's the electromagnetic wave rippling through the electrons that propagates at close to the speed of light. The dimensions of the wire and electrical properties like its inductance affect the exact propagation speed, but usually it will be around 90 per cent of the speed of light – about 270,000 km/s.
Q 2 siemens per meter
The unit of electrical conductivity is, by definition, the reciprocal of electrical resistivity, S/m (siemens per meter) in SI units.
Q 3 The device used for producing electric current is called (1) Ammeter(2) Generator(3) Galvanometer(4) Motor. The system used to generate electrical current is called a Generator. The generator converts electrical energy into mechanical energy.
Q 4 verb
1.
join or blend to form a single entity.
"intermarriage had fused the families into a large unit"
2.
BRITISH
(of an electrical appliance) stop working when a fuse melts.
"the crew were left in darkness after the lights fused"
Q 5 Domestic appliances based on the heating effect of electric current:
Electric Iron.
Electric heater.
Electric geyser.
Induction Cooker.
Microwave Oven.
Hair blower.
Q 6 Examples of insulators include plastics, Styrofoam, paper, rubber, glass and dry air.
Q 7 A battery is an electrochemical cell (or enclosed and protected material) that can be charged electrically to provide a static potential for power or released electrical charge when needed. A battery generally consists of an anode, a cathode, and an electrolyte.