1Electricitynumerical-application
A resistor carries a current of when connected to a potential difference of . Find its resistance.
Answer
.
Solution
Ohm's law gives . Rearranging, . Substitution gives a resistance of .
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Science Important Questions
CBSE CLASS 10 SCIENCE
Electricity Important Questions
Syllabus-aligned Electricity questions with clear answers, explanations and application-focused practice for CBSE Class 10 Science.
Electric current and chargePotential difference and metersResistance and resistivityCombination of resistorsHeating effect and electric powerHousehold circuits and safety
Questions
2
Chapter
Electricity
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Important Questions
2Electricitycase-study
Why are household appliances connected in parallel? State the function of a fuse.
Answer
Parallel connection gives each appliance its rated voltage and independent operation. A fuse melts during excessive current and breaks the circuit.
Solution
In parallel, switching off one appliance does not stop the others. A fuse wire of suitable rating heats up and melts when current exceeds the safe limit.