Heating Effects and Electrical Appliances

The video explores the heating effect of electric current, explaining its causes, factors affecting it, and practical applications. It introduces Joule's Law of Heating and discusses how electric current can produce heating, magnetic, and chemical effects. The video also covers the use of the heating effect in various appliances like electric irons, bulbs, and fuses, highlighting the importance of resistance and material properties in these applications.

Which of the following is NOT an effect of electric current?

• Heating effect

• Gravitational effect

• Magnetic effect

• Chemical effect

What causes the heating effect in a resistance wire?

• The presence of magnetic fields

• The absence of resistance

• The collision of electrons with atoms

• The flow of protons

According to Joule's Law, which factor does NOT affect the heat produced in a wire?

• Time

• Current

• Color of the wire

• Resistance

If the current in a wire is doubled, how does the heat produced change?

• It halves

• It quadruples

• It doubles

• It remains the same

Which appliance converts most of its electrical energy into heat energy?

• Electric fan

• Electric heater

• Washing machine

• Mixer grinder

Why is nichrome used in heating elements?

• It has low resistance

• It is a good conductor

• It has a high melting point

• It is cheap

What is the main reason incandescent bulbs are being replaced by CFL or LED bulbs?

• They are more power efficient

• They are brighter

• They are smaller

• They are cheaper

What is the purpose of the gas inside an incandescent bulb?

• To increase the bulb's brightness

• To react with tungsten

• To prevent the tungsten filament from burning

• To cool the bulb

What material is commonly used for fuse wires?

• Solder (tin and lead alloy)

• Aluminum

• Iron

• Copper

How does a fuse protect an electrical appliance?

• By melting and breaking the circuit

• By reducing the voltage

• By cooling the appliance

• By increasing the current