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How should the two resistances of 2 ohms each be connencted so as to produce an equivalent resistance of 1 ohm ? We know that. Solution : Work done = Potential difference x Charge moved (a) What do you understand by the “resistivity” of a substance ? R = V2/P = 2402/240 Solution : Question 25: (e) The potential difference between the terminals of an electric iron is 240 V and the current is 5.0 A. (b) the current flowing (a) In case of series connection, if filament of one lamp breaks, the other wil stop glowing. Solution : (d) What is meant by the heating effect of current ? What is the mistake ? Solution : How many joules are there in one kilowatt-hour ? (c) the energy consumed in 2 hours, and Which effect of current is utilised in the working of an electric fuse ? Question 18: (a) Parallel circuit (a) What is the combined resistance ? If the parallel and series combination of lamps are connected to 220 V supply line one by one, what will be the ratio of electric power consumed by them ? Question 7: Therefore, 5kwh = 5 x 3.6 x 106 J = 18 x 106 J. In case of parallel combination, the resultant resistance will be less than either of the individual resistances. (b) (i) Given: p.d. Ohm’s law states a relation between potential difference and…………………… What will happen to the heat produced by it ? Question 36: (d) C and E, because of their low electrical resistivities. Solution : Which material will you use for making : (a) heating element of electric iron (b) connecting wires of electric iron (c) covering of connecting wires ? A current of 8 A flows through the heater. Question 6: Solution : Solution : Question 33: Unit of electric potential is volt. We know that Ammeter is a device used for the measurement of electric current. Question 13: 120 = 2.4 x R Question 7: Question 17: These solutions help students in exams as well as their daily homework. Solution : Thus, If air is filled in an electric bulb, then the extremely hot tungsten filament would burn up quickly in the oxygen of air. Lakhmir Singh Physics Class 10 Solutions Page No:49. Which of the following statements correctly defines a volt ? Question 6: Question 4: (b) total current in the circuit. The Lakhmir Singh Physics Chapter 1 Electricity Solutions Class 10 can help you make your concepts strong with the help of questions having a different level of difficulty. Now it is the time to solve unsolved assignments and worksheets. (b) Which circuit would have the highest voltage across each bulb ? (b) What current flows from the battery ? Question 5: Question 14: Question 9: (i) What is the current through the 5 ohm resistance ? I = 920/230 = 4amp. CL provides CBSE Physics prep material for class 10 students. Question 18: The figure given below shows an electric circuit in which current flows from a 6 V battery through two resistors. across each resistor is same and is equal to the voltage applied. Which electric heating devices in your home do you think have resistors which control the flow of electricity ? (ii) potential difference across 12 Ω resistor ? We know that Why are copper and aluminium wires usually used for electricity transmission ? Free Online Mock Test for CBSE Class 10 Physics for important topics of all chapters in CBSE Class 10 Physics book. Solution : Question 8: Resistance also gets doubled. The table below shows the current in three different electrical appliances when connected to the 240 V mains supply : Solution : Introduction to Physics. = 24 joules. R = 240/5 = 48 ohm. If the lamps are both the same in the figure given below and if A1, reads 0.50 A, what do A2, A3, A4 and A5 read ? V=IR (b) Q; because it has very low resistivity of 1.7/100000000 ohm-m (it is actually copper). (b) Presence of impurities in a metal increases the resistance. Three 2 V cells are connected in series and used as a battery in a circuit. The graph between V and 1 for a conductor is a straight line passing through the origin.