Electricity: Magnetic & Heating Effects

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Magnetic & heating concepts quiz

Hamsa Lekha

India

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Electricity: Magnetic & Heating Effects


Froggy Jumps Electricity: Magnetic & Heating EffectsVersion en ligne Magnetic & heating concepts quiz par Hamsa Lekha 1 What happens when electric current passes through a conductor? a It produces heat due to I^2R losses. b It cools the conductor c It changes color immediately 2 Which device demonstrates the magnetic effect of current to lift objects? a A diode b Electromagnet c A resistor 3 The heating effect of electric current is most useful in which appliance? a Electric heater b Television c Fan 4 Which factors affect heating effect in a circuit? a Voltage only b Frequency only c Current, resistance, and time 5 To get more heating in a wire, you should increase: a Only current b Current, resistance, and time c Only length of wire 6 To strengthen the magnetic field of a coil, you should: a Remove the core b Increase current, number of turns, and use an iron core c Decrease current 7 Why is an insulating coating important on wires? a Prevents electric shocks and short circuits b It absorbs heat c It lowers resistance 8 What is a magnet produced by electric current called? a An electromagnet b A permanent magnet c A bar magnet 9 Which device/effect is used in loudspeakers to move the diaphragm? a Chemical effect b Heating effect only c Magnetic effect of current 10 The unit of electric current is what? a Ohm (Ω) b Ampere (A) c Volt (V)