JOULES LAW OF HEATING EFFECT ELECTRICITY 12 Class 10th Physics (Practice Sheet) 1 Which of the following statements is true about Joule's Law of Heating Effect? A. The amount of heat produced is directly proportional to the voltage across the resistor. B. The amount of heat produced is inversely proportional to the resistance of the resistor. C. The amount of heat produced is directly proportional to the square of the current passing through the resistor. D. The amount of heat produced is directly proportional to the resistance of the resistor. 2 An electric heater is rated at 1000W. If it is connected to a voltage of 220V, what is the resistance of the heater? A. 20Ω B. 22Ω C. 200Ω D. 220Ω 3 If the current passing through a resistor is doubled while the voltage across it remains the same, how will the heat produced change? A. It will become half. B. It will become half. C. It will remain the same. D. It will become double. 4 A current of 2A passes through a resistor with a resistance of 5Ω. How much heat is produced in 10 seconds? A. 40J B. 20J C. 100J D. 200J 5 In which of the following cases would the heating effect be the highest? A. A high resistance wire with low current. B. A low resistance wire with high current. C. A low resistance wire with high current. D. A low resistance wire with low current. 6 100J of heat energy is produced by an electrical appliance that is used for 1 sec and is having a resistance of 4 ohms. Find and calculate the potential difference of the appliance. 7 Find out the heat produced by the electric toaster when it is used for 5 minutes. The current given was 2A and its resistance is 3 ohms. 8 The heat generated is 100J from an electrical fan which has a potential difference of 10V and the time for which it is used is 10 sec. Find what the amount of electrical current that is used is? 9 What is the power consumed if a device or appliance is operated at 1V potential difference and 6A current? 10 What is the power consumed if a toaster having 3 ohm resistance is operated at 1A current? Page 1 Email: Phone No: Website:
[email protected] +91 93299 65211 www.brisklearning.com Address: Office No. 605, CTS No. 658, Gayatri Bhuvan, A & B, Kandivali, Dattani Park, Thakur Village, Kandivali East, Mumbai, Maharashtra 400101
English