Q1
What does Ohm's law state?
AV=IR
BV=I+R
CV=I/R
DV=I-R
SSCClass 9 (SSC)Science and Technology (विज्ञान आणि तंत्रज्ञान)Ch 3 · Topic 1
Current Electricity
Current electricity involves the flow of electric charge, following Ohm's law, essential for understanding circuits and everyday electrical
Core concept
Ohm's law states current is directly proportional to voltage at constant temperature: V=IR, where V is voltage, I is current, R is resistance.
How it works
In a series circuit, current remains the same throughout, while voltage divides across components, and resistances add directly.
Why it matters
In a parallel circuit, voltage remains the same across each branch, while current divides, and resistances combine using reciprocals.
Key detail
Electrical power, calculated as P=VI, indicates the rate of energy consumption, important for understanding appliance energy usage.
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Quick notes
• Ohm's law: V=IR (constant temperature).
• V=voltage, I=current, R=resistance.
• Series circuit: same current, voltage divides.
• Resistances add directly in series.
• Parallel circuit: same voltage, current divides.
• Resistances combine via reciprocals in parallel.
• Power: P=VI, rate of energy use.
• This matters for appliance energy usage.