- Define Ohm’s law.
Answer. The current that flows through most conductors is directly proportional to the voltage applied. The voltage across a conductor is directly proportional to the current flowing through it, provided all physical conditions and temperatures remain constant.
- What is the formula of Ohm’s law?
Answer. Ohm’s law is given by the formula: V=IR
Where, I=current, V=volatge, and R=Resistance.
- What is specific resistance?
Answer. The resistance offered per unit length and unit cross-sectional area when a known amount of voltage is applied is known as the specific resistance.
- What is the SI unit of the potential difference?
Answer. The SI unit of the potential difference is volt.
- The current is measured in which unit?
Answer. The unit of electric current is Ampere.
- What is the unit of resistance?
Answer. The unit of the electrical resistance is Ohms.
- Does the resistance depend on the temperature?
Answer. Yes, the resistance depends on the temperature. As the temperature increases, the resistance also increases.
- What are the various sources of error while performing this experiment?
Answer: Various sources of error are:
- The instrument screws may be loose.
- Lack of thick connecting wires.
- Using rheostat of high resistance.
- What is electrical conductivity?
Answer. It is the measure of the ability of the material to allow the electric current to pass through it.
- Define a rheostat.
Answer. A rheostat is a two-terminal electrical device. The rheostat is a variable resistor whose resistance can be changed to change the current flowing amount through a circuit.
- State true or false: The potential difference across the wire varies linearly with the current.
Answer. TRUE. The potential difference across the wire varies linearly with the current.
- Does the resistance depend on the dimensions of the conductor?
Answer. Yes, the resistance depends on the dimensions of the conductor.
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