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FAQs on Quick Revision: Current Electricity - Physics for Airmen Group X - Airforce X Y / Indian Navy SSR

1. What is current electricity?
Ans. Current electricity refers to the flow of electric charge in a conducting medium, such as a wire. It is the movement of electrons through a closed circuit, resulting in the production of electrical energy.
2. What is the difference between AC and DC current?
Ans. AC (alternating current) and DC (direct current) are two types of current electricity. AC current periodically changes direction, while DC current flows in only one direction. AC current is commonly used in household electricity, while DC current is used in batteries and electronic devices.
3. How is current measured?
Ans. Current is measured using a device called an ammeter. It is connected in series with the circuit and measures the flow of electric charge by detecting the number of electrons passing through a specific point in the circuit per unit time. The unit of current is ampere (A).
4. What is resistance?
Ans. Resistance is a property of a material that opposes the flow of electric current. It is determined by the material's composition, dimensions, and temperature. The unit of resistance is ohm (Ω). Ohm's law states that the current flowing through a conductor is directly proportional to the voltage applied and inversely proportional to the resistance.
5. How does an electric circuit work?
Ans. An electric circuit is a closed loop through which electric current can flow. It consists of a power source (such as a battery), conductive wires, and various components (such as resistors, capacitors, and switches). When a voltage is applied across the circuit, the electrons start to flow, creating a current. The circuit components control the flow of current and allow the desired electrical operation to occur.
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