12 Questions
According to Ohm's Law, what is the relationship between current (I) and voltage (V)?
Directly proportional
What is the SI unit of electric current?
Ampere
What factors does resistance depend on in a conductor?
Material, length, cross-sectional area, and temperature
What is the measure of a material's ability to conduct electric current?
Resistivity
In most conductors, what happens to resistance as temperature increases?
Increases
How can resistors be connected in an electrical circuit?
In series, parallel, or a combination of both
Which law states that the total current entering a junction is equal to the total current leaving the junction?
Kirchhoff's Current Law
What determines the equivalent resistance of resistors in parallel?
The reciprocal of the sum of reciprocals
What is the relationship between electrical power and voltage in an electric circuit?
Directly proportional
According to Joule's Law of Heating, what is the heat produced in a resistor proportional to?
Resistance of the resistor
What is EMF referring to when discussing cells and batteries?
Electromotive Force
In an electric circuit, what does internal resistance affect in a battery?
Ability to deliver current
Study Notes
Ohm's Law and Electric Current
- Ohm's Law states that the relationship between current (I) and voltage (V) is I = V/R, where R is the resistance.
- The SI unit of electric current is the Ampere (A).
Resistance in Conductors
- Resistance in a conductor depends on the material, length, and cross-sectional area of the conductor.
- The measure of a material's ability to conduct electric current is its conductivity.
- In most conductors, resistance increases as temperature increases.
Connecting Resistors
- Resistors can be connected in series, parallel, or a combination of both in an electrical circuit.
Kirchhoff's Laws
- Kirchhoff's Current Law (KCL) states that the total current entering a junction is equal to the total current leaving the junction.
Resistors in Parallel
- The equivalent resistance of resistors in parallel is less than the resistance of any individual resistor.
Electrical Power and Voltage
- The relationship between electrical power and voltage in an electric circuit is P = V*I, where P is the power.
Joule's Law of Heating
- According to Joule's Law of Heating, the heat produced in a resistor is proportional to the square of the current (I^2) and the resistance (R).
EMF and Internal Resistance
- EMF (Electromotive Force) refers to the voltage supplied by a cell or battery.
- Internal resistance in a battery affects the voltage supplied by the battery, reducing the EMF.
Test your knowledge on the chapter about current electricity in the 12th class Physics syllabus. Topics include electric current, Ohm's Law, and electrical circuits. Prepare for your exams with this quiz!
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