Electricity and Magnetism - SS1 Physics Past Questions and Answers - page 1
Kirchhoff's first law is also known as:
Law of Conservation of Energy
Ohm's Law
Junction Rule
Loop Rule
Kirchhoff's second law is also known as:
Law of Conservation of Energy
Ohm's Law
Junction Rule
Loop Rule
According to Kirchhoff's laws, the algebraic sum of currents at any junction in a circuit is:
Zero
Positive
Negative
Constant
According to Kirchhoff's laws, the algebraic sum of potential differences in any closed loop of a circuit is:
Zero
Positive
Negative
Constant
Kirchhoff's laws are based on the principle of:
Conservation of Charge
Conservation of Energy
Conservation of Momentum
Conservation of Mass
Explain Kirchhoff's laws and their significance in analysing electric circuits.
Kirchhoff's laws are fundamental principles used in analysing electric circuits.
Kirchhoff's current law (KCL) states that the algebraic sum of currents entering and leaving a node (or junction) in a circuit is zero. This law is based on the principle of conservation of charge, stating that the total current flowing into a node must be equal to the total current flowing out of it. KCL allows us to determine unknown currents in complex circuits and ensures the flow of current is consistent throughout the circuit.
Kirchhoff's voltage law (KVL) states that the algebraic sum of the potential differences (voltages) around any closed loop in a circuit is zero. This law is based on the principle of conservation of energy, stating that the total energy supplied by a source must be equal to the total energy consumed by the circuit components. KVL allows us to determine unknown voltages in complex circuits and ensures the conservation of energy within the circuit.
The significance of Kirchhoff's laws is that they provide a systematic and consistent method for analyzing and solving complex electrical circuits. By applying KCL and KVL, we can determine unknown currents and voltages, calculate power dissipation, and verify the overall electrical balance within a circuit. These laws form the foundation for circuit analysis and are essential in designing and troubleshooting electrical systems.
What is the basic function of a capacitor in an electrical circuit?
To regulate the voltage
To store and release electrical energy
To convert AC to DC
To amplify the signal
Capacitance is a measure of a capacitor's ability to store:
Voltage
Current
Power
Charge
The capacitance of a capacitor depends on:
Its size and shape
The material used for the plates
The distance between the plates
All of the above