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FAQs on Irodov Solutions: Electric Current (3.4) - Physics Class 12

1. What is electric current and how is it measured?
Ans. Electric current is the flow of electric charge in a conductor. It is measured in units called amperes (A) using an ammeter, which is connected in series with the circuit.
2. What is the difference between direct current (DC) and alternating current (AC)?
Ans. Direct current (DC) flows continuously in one direction, while alternating current (AC) periodically changes direction. DC is commonly found in batteries, while AC is used in household electricity.
3. How does resistance affect electric current?
Ans. Resistance is a property of a material that opposes the flow of electric current. According to Ohm's law, the current flowing through a conductor is directly proportional to the voltage applied and inversely proportional to the resistance. Therefore, an increase in resistance leads to a decrease in current.
4. Can you explain the concept of electric power?
Ans. Electric power is the rate at which electrical energy is transferred or consumed. It is calculated by multiplying the current flowing through a device or circuit by the voltage across it. The unit of electric power is the watt (W).
5. What is the difference between series and parallel circuits?
Ans. In a series circuit, the components are connected one after another, forming a single path for current flow. The same current passes through each component. In a parallel circuit, the components are connected across multiple paths, allowing the current to divide among them.
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