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Out of the following, which is not a source of electrical energy?
Solar cell
Battery
Potentiometer
Genertor
Potentiometer
A source of electrical energy is a device that converts non-electrical energy (chemical, mechanical, or radiant) into electrical energy. A potentiometer is a three-terminal passive resistive component used to create a variable voltage divider, not a generator or storage of energy.
A source of electrical energy is a device that converts non-electrical energy (chemical, mechanical, or radiant) into electrical energy. A potentiometer is a three-terminal passive resistive component used to create a variable voltage divider, not a generator or storage of energy.
VoutтАЛ=VinтАЛтЛЕR1тАЛ+R2тАЛR2тАЛтАЛ тАФ Output voltage of a potentiometer
P=I2R тАФ Power dissipation in a resistor
A potentiometer acts as a variable resistor that provides a controllable output voltage by dividing the input voltage across its resistive track. Since it is a passive element, it cannot supply energy to a circuit and actually dissipates power in the form of heat according to P=RV2тАЛ.
A solar cell converts light energy into electrical energy (Photovoltaic effect).
A battery converts stored chemical energy into electrical energy.
A generator converts mechanical energy into electrical energy (Faraday's Law of Induction).
A potentiometer is a purely passive resistive device.
Potentiometers allow for precise manual adjustment of voltage levels.
Used extensively as control knobs in electronic circuits.
Cannot act as a voltage source.
Causes power loss due to internal resistance heating.
Volume control in audio equipment.
Position sensing in industrial sensors.
Calibration of reference voltages.
Options A, B, and D describe active devices capable of maintaining a potential difference.
Generator refers to 'Generator' (correcting the typo in the original option).
C is correct тАФ A potentiometer is a passive resistive device used to divide voltage rather than generate or store electrical energy.
In exams, remember that active elements (sources) provide energy to the circuit, while passive elements (resistors, inductors, capacitors) either store or dissipate it.