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Electric Current & Circuits Video Lecture | Science & Pedagogy Paper 2 for CTET & TET Exams - CTET & State TET
FAQs on Electric Current & Circuits Video Lecture - Science & Pedagogy Paper 2 for CTET & TET Exams - CTET & State TET
| 1. What is electric current and how is it related to circuits? |  |
Ans. Electric current is the flow of electric charge in a conductor. It is measured in amperes (A) and is caused by the movement of electrons. Circuits are paths through which electric current can flow, usually consisting of a power source (such as a battery), conductors, and load devices (such as light bulbs). Electric current is essential for circuits to function.
| 2. What is the difference between direct current (DC) and alternating current (AC)? | |
Ans. Direct current (DC) is the flow of electric charge in one direction only, while alternating current (AC) periodically changes direction. DC is commonly produced by batteries and used in devices like laptops and mobile phones. AC, on the other hand, is what is supplied to our homes and is used for powering appliances and lighting.
| 3. How does an electric circuit work? | |
Ans. An electric circuit works by creating a complete path for the flow of electric current. When a circuit is closed or completed, the electric current can flow from the power source through the conductors and load devices, allowing them to operate. If the circuit is open or broken, the flow of current is interrupted, and the devices won't work.
| 4. What are series and parallel circuits? | |
Ans. In a series circuit, the components are connected one after the other, creating a single path for the electric current. If one component fails or is removed, the circuit is broken, and all components stop working. In a parallel circuit, the components are connected in branches, allowing multiple paths for the electric current. If one component fails, the others continue to function independently.
| 5. What is resistance in an electric circuit? | |
Ans. Resistance is a property of materials that hinders the flow of electric current. It is measured in ohms (Ω). Components such as resistors are used in circuits to control the flow of current and reduce the amount of current passing through certain parts. Resistance can also cause a voltage drop across a component, converting electrical energy into other forms such as heat or light.
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