Question:medium
An electric iron rated \(2.2\,\text{kW},\,220\,\text{V}\) is operated at \(110\,\text{V}\) supply. Find:
(i) its resistance, and
(ii) heat produced by it in \(10\) minutes.
An electric iron rated \(2.2\,\text{kW},\,220\,\text{V}\) is operated at \(110\,\text{V}\) supply. Find:
(i) its resistance, and
(ii) heat produced by it in \(10\) minutes.
Show Hint
For electrical appliances,
\[
P=\frac{V^2}{R}
\]
is usually the quickest formula to find resistance from the rating. Once resistance is known, use the same formula again for any new operating voltage.
Updated On: Jul 2, 2026
Show Solution
Solution and Explanation
Was this answer helpful?
0
Top Questions on Cells, Emf, Internal Resistance
- A battery of emf 12 V and internal resistance 3 \(\Omega\) is connected to an external resistor. If the current in the circuit is 0.6 A, the voltage across the external resistor will be
- CUET (UG) - 2025
- Physics
- Cells, Emf, Internal Resistance
- The resistances of the four arms P, Q, R and S in a Wheatstone's bridge are 10 ohm, 30 ohm, 30 ohm and 90 ohm, respectively. The e.m.f. and internal resistance of the cell are 7 volt and 5 ohm respectively. If the galvanometer resistance is 50 ohm, the current drawn from the cell will be
- NEET (UG) - 2013
- Physics
- Cells, Emf, Internal Resistance
- The internal resistance of a 2.1 V cell which gives a current of 0.2 A through a resistance of 10 Ω is
- NEET (UG) - 2013
- Physics
- Cells, Emf, Internal Resistance
- In the circuit shown in the figure, the input voltage Vi is 20V, VBE = 0 and VCE = 0. The values of IB , IC and β are given by
- NEET (UG) - 2018
- Physics
- Cells, Emf, Internal Resistance
- Want to practice more? Try solving extra ecology questions todayView All Questions