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Class 10 Physics Chapter 14 Notes
|Chapter 5 – 14
Class 10 Physics Chapter 14 Important Short Questions
- The time rate of flow of electric charge through any cross-section is called electric current.
- The current due to the flow of positive charge equivalent to the current due to the flow of negative charge in the opposite direction is known as conventional current.
- Ampere is the SI unit of current.
- e.m.f. is the total amount of energy supplied by the battery or the cell in moving one coulomb of positive charge from the -ve to the +ve terminal of the battery.
- Ohm’s law states that the current I passing through a conductor is directly proportional to the potential difference V applied across its ends provided the temperature and physical state of the conductor do not change.
- Resistance R is a measure of opposition to the current flow through a conductor. Its SI unit is ohm. It is denoted by the symbol Ω. When a potential difference of one volt is applied across the ends of a conductor and one ampere of current passes through it, then its resistance will be one ohm.
- Materials in which electrons can freely move so as to pass electricity are called conductors while in insulators no free electrons are available for the conduction of electricity.
- The equivalent resistance R of a series combination of ‘n’ resistances is given by
- The equivalent resistance R of a parallel combination of ‘n’ resistances is given by
- A galvanometer is a sensitive instrument that detects current in a circuit. It is always connected in series with the circuit.
- An ammeter is an electrical instrument that measures a larger current. It is always connected in series in a circuit.
- A voltmeter is an electrical instrument used to measure the potential difference between two points in a circuit. It is always connected parallel to a circuit component.
- The amount of heat energy generated in a resistance due to the flow of electric current is equal to the product of the square of current, resistance, and the time interval ( W 2= I Rt). This is called Joule’s law.
- kilowatt-hour is the amount of energy obtained from a source of one kilowatt in one hour. It is equal to 3.6 megajoules.
- The current that does not change its flow direction is known as direct current or d.c.
- The current that changes its flow direction after regular intervals of time is known as alternating current or a.c.
- Define and explain the term electric current.
- What is the difference between electronic current and conventional current?
- What do we mean by the term e.m.f? Is it really a force? Explain.
- How can we differentiate between e.m.f. and potential difference?
- Explain Ohm’s law. What are its limitations?
- Define resistance and its units.
- What is the difference between conductors and insulators?
- Explain the energy dissipation in a resistance. What is Joule’s law?
- What is the difference between D.C and A.C?
- Discuss the main features of parallel combinations of resistors.
- Determine the equivalent resistance of a series combination of resistors.
- Describe briefly the hazards of household electricity.
- Describe four safety measures that should be taken concerning the household circuit.
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