Which of the following is the SI unit of electrical resistance ?
Ohm
Electrical resistance is defined by Ohm's law as \(R = \dfrac{V}{I}\), and its SI unit is the ohm (\(\Omega\)), named after Georg Simon Ohm.
Ampere is the SI unit of electric current, watt is the SI unit of power, and volt is the SI unit of potential difference — none of these measures resistance.
Therefore, the SI unit of electrical resistance is the ohm.
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Important Questions from Current Electricity
- In a parallel combination of resistors, which of the following quantities remains the same across all the resistors?
- Which of the following statements is/are true for a domestic circuit?
(i) All the appliances are connected in parallel.
(ii) The live wire in the domestic circuit has green insulation on it.
(iii) A fuse connected to the circuit allows excessive current to pass through the appliances.
(iv) The neutral wire in the domestic circuits has black insulation on it. A science teacher asks students to measure the current through a bulb using an ammeter. What precaution must the students follow?
- Which characteristic of parallel circuits makes them advantageous over series circuits for connecting multiple electrical gadgets in a house?
- In a domestic electric circuit, the main purpose of a FUSE is ________.
