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Current Electricity in One Shot (NCERT) - 1 Video Lecture | Physics Class 12 - NEET

157 videos|453 docs|185 tests

FAQs on Current Electricity in One Shot (NCERT) - 1 Video Lecture - Physics Class 12 - NEET

1. What is the concept of current electricity?
Ans. Current electricity refers to the flow of electric charge in a conductor. It is caused by the movement of electrons through a closed circuit. The flow of electrons creates an electric current, which can be used to power various electrical devices.
2. How is current measured in a circuit?
Ans. Current is measured using a device called an ammeter. The ammeter is connected in series with the circuit, allowing the current to flow through it. The reading on the ammeter indicates the magnitude of the current flowing through the circuit.
3. What is the relationship between current and voltage in a circuit?
Ans. According to Ohm's Law, the relationship between current (I), voltage (V), and resistance (R) in a circuit can be expressed as V = IR. This means that the current flowing through a circuit is directly proportional to the voltage applied across it, while inversely proportional to the resistance of the circuit.
4. What is the difference between AC and DC current?
Ans. AC (Alternating Current) and DC (Direct Current) are two types of current used in electrical systems. DC flows in one direction, while AC constantly changes direction. DC is commonly used in batteries and electronic devices, while AC is used for household electricity supply.
5. What are the factors that affect the resistance of a conductor?
Ans. The resistance of a conductor depends on several factors, including its length, cross-sectional area, temperature, and the material from which it is made. Longer conductors have higher resistance, while wider conductors have lower resistance. The resistance of most materials increases with temperature, except for certain materials like superconductors.
157 videos|453 docs|185 tests
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