JEE · Physics · Current Electricity doubts

8 doubts found

All Physics Chemistry Maths

What does “Ohm's law” actually mean in Current Electricity, and why does it matter for JEE?

for many conductors V = IR at constant temperature.

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JEEPhysicsmedium

I keep getting “Ohm's law” questions wrong in Current Electricity. What's the trap?

assuming every component is ohmic (a diode or bulb filament is not).

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What does “Resistance and resistivity” actually mean in Current Electricity, and why does it matter for JEE?

R = ρL/A: resistance grows with length and shrinks with cross-section; resistivity ρ is the material's own property.

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JEEPhysicsmedium

I keep getting “Resistance and resistivity” questions wrong in Current Electricity. What's the trap?

confusing resistance (depends on shape) with resistivity (depends only on material and temperature).

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What does “Series and parallel resistors” actually mean in Current Electricity, and why does it matter for JEE?

in series the current is the same and resistances add; in parallel the voltage is the same and 1/R values add.

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JEEPhysicsmedium

I keep getting “Series and parallel resistors” questions wrong in Current Electricity. What's the trap?

adding parallel resistances directly instead of their reciprocals.

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What does “EMF and terminal voltage” actually mean in Current Electricity, and why does it matter for JEE?

EMF is the battery's full push; terminal voltage is what's left after the internal resistance drops some of it.

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JEEPhysicsmedium

I keep getting “EMF and terminal voltage” questions wrong in Current Electricity. What's the trap?

assuming terminal voltage equals EMF even when current flows.

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