9 Questions
What is the significance of the ISI mark assigned by the Bureau of Indian Standards on products?
It is an assurance of conformity to the specifications given on the products
Why are LED bulbs preferred over incandescent bulbs, fluorescent tubes, and CFLs?
LED bulbs consume less electricity for producing a given intensity of light
What happens to the circuit when the switch is in the 'OFF' position?
The circuit is incomplete and considered open, with no current flowing.
What causes the filament of a bulb to glow?
When an electric current passes through it.
How does the wire in the bulb feel after the bulb has been glowing for a minute?
The wire gets hot.
Why does the bulb glow only when the switch in the circuit is in the 'ON' position?
The bulb glows only when the switch is in the 'ON' position because it completes the electric circuit, allowing current to flow through the bulb.
Can you provide examples of electric appliances that utilize the heating effect of electric current?
Toaster, electric iron, hair dryer, electric oven.
What precaution is mentioned regarding handling a lighted electric bulb connected to the mains?
The precaution mentioned is to never touch a lighted electric bulb connected to the mains as it may be very hot and cause burns to the hand.
How is drawing a circuit diagram using symbols beneficial in representing an electric circuit?
Drawing a circuit diagram using symbols is beneficial as it makes it much easier to understand and represent an electric circuit visually.
Test your knowledge on electric appliances, efficiency, and lighting sources. Learn about the wastage of electricity in producing heat and the advantages of fluorescent tube-lights and compact fluorescent lamps (CFLs).
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