# Class 10 Electricity Important Questions

Important Questions Previous Years Questions Notes**Electricity Important Questions**

**The potential difference between the terminals of an electric heater is 60 V when it draws a current of 4 A from the source. What current will the heater draw if the potential difference is increased to 120 V.****The V-I graph of three resistors is shown below. Which resistor has maximum resistance**?**An electric iron is marked 400 W and 220 V. What is the resistance when iron is hot? How long could it be used for ₹3 of electrical energy that costs 15 paise per unit.****A 20 cm long uniform wire of resistance 5 Ω is stretched to a uniform wire of 40 cm length. What will be the resistance of new wire?****If R**_{1}and R_{2}are the resistances of filaments of a 400 W and a 200 W lamp, designed to operate on the same voltage, then find the relationship between R_{1}and R_{2}.**.****State Ohm’s law and write its expression.****Draw a circuit diagram to verify Ohm’s law.**

**The rating of bulb B**._{1}is 60 V, 12 W & bulb B_{2}is 100 V, 100 W. Find the maximum emf of the battery so that all bulbs remain safe**Find equivalent resistance between P and Q**:**Find equivalent resistance**:**In reference to the given figure, find the current flowing through 20 Ω resistor**.

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