Effects of electric current
Maharashtra Board · Class 10 · Science
Flashcards for Effects of electric current — Maharashtra Board Class 10 Science. Quick Q&A cards covering key concepts, definitions, and formulas.
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What happens to electrical energy when current flows through a resistor?
Answer
The electrical energy given by the cell is converted into heat energy in the resistor, and the temperature of the resistor increases.
State the formula for electrical power.
Answer
Electrical power = P = V_AB × I, where V_AB is the potential difference and I is the current.
A circuit has a potential difference of 12 V and current of 2 A. Find the electrical power.
Answer
Use P = V_AB × I = 12 V × 2 A = 24 W. The electrical power is 24 W.
How is heat produced in a resistor written in formula form?
Answer
Heat produced is H = P × t = V_AB × I × t.
State Joule's law of heating.
Answer
Joule's law of heating is H = I² × R × t.
A resistor of 5 Ω carries a current of 3 A for 4 s. Find the heat produced.
Answer
Use H = I² × R × t = 3² × 5 × 4 = 9 × 5 × 4 = 180 J. The heat produced is 180 J.
Why is Nichrome used in heating appliances like heaters and cookers?
Answer
Nichrome is an alloy with higher resistivity, so it produces more heat when current flows through it. It is used as a resistor coil in heating appliances.
Why is tungsten used in an electric bulb?
Answer
Tungsten wire gets heated to nearly 3400°C and emits light. That is why it is used in bulbs.
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