Question 2a). Three lamps A, B and C are connected in parallel to a 220Vsupply. If the lampsare rated 40W, 60W and 100W respectively,i) Explain which one of the lamps will have the highest brightness.ii) If any of the lamps is removed from the circuit or develop a fault, what will bethe effect on circuit?iii) Calculate the current that will flow through each of the lamp as in (a) above.b). In the circuit below, capacitors P, Q and R are identical; and the totalcapacitance of the circuit is 3uF. Determine the values of P, Q and R.3.5 UF2µF4.5 µFc) For the bar magnets shown below, draw the magnetic field/pattern around themas they have been arranged and state whether a neutral point exist or not.magnetmagnet(d) Determine the values and tolerances of resistors having the following colourcoding;i) Blue-Grey-Orange-Redii) Yellow-Violet-Goldiii) Blue-White-Black-Black-Gold

Answered: Image /qna-images/answer/74ac1191-fa4b-475e-a534-35beb6be6c74.jpg

Question 2 a). Three lamps A, B and C are connected in parallel to a 220Vsupply. If the lamps are rated 40W, 60W and 100W respectively, i) Explain which one of the lamps will have the highest brightness. ii) If any of the lamps is removed from the circuit or develop a fault, what will be the effect on circuit? iii) Calculate the current that will flow through each of the lamp as in (a) above.

Question 2 a). Three lamps A, B and C are connected in parallel to a 220Vsupply. If the lamps are rated 40W, 60W and 100W respectively, i) Explain which one of the lamps will have the highest brightness. ii) If any of the lamps is removed from the circuit or develop a fault, what will be the effect on circuit? iii) Calculate the current that will flow through each of the lamp as in (a) above.

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter9: Current And Resistance

Section: Chapter Questions

Problem 9.2CYU: Check Your Understanding Circuit breakers in a home are rated in amperes, normally in a range from...

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Check Your Understanding Circuit breakers in a home are rated in amperes, normally in a range from 10 amps to 30 amps, and are used to protect the residents from harm and their appliances from damage due to large currents. A single 15-amp circuit breaker may be used to protect several outlets in the living room, whereas a single 20-amp circuit breaker may be used to protect the refrigerator in the kitchen. What can you deduce from this about current used by the various appliances?
Refer to Figure 21.7 and the discussion of lights dimming when a heavy appliance comes on. (a) Given the voltage source is 120 V, the wire resistance is 0.400, and the bulb is nominally 75.0 W, what power will the bulb dissipate if a total of 15.0 A passes through the wires when the motor comes on? Assume negligible change in bulb resistance. (b) What power is consumed by the motor?
An office worker uses an immersion heater to warm 250 g of water in a light, covered, insulated cup from 20.C to 100. C in 4.00 minutes. The heater is a Nichrome resistance wire connected to a 120-V power supply. Assume the wire is at 100. C throughout the 4.00-min time interval. (a) Calculate the average power required to warm the water to 100. C in 4.00 min. (b) Calculate the required resistance in the heating element at 100. C. (c) Calculate the resistance of the heating element at 20. C. (d) Derive a relationship between the diameter of the wire, the resistivity at 20. C, 0, the resistance at 20. C, R0, and the length L. (e) If L = 3.00 m, what is the diameter of the wire?
A short circuit in a 120-V appliance cord has a0.500- resistance. Calculate the temperature rise of the2.00 g of surrounding materials, assuming their specific heat capacity is 0.200cal/gC and that it takes 0.0500 sfor a circuit breaker to interrupt the current. Is this likely to be damaging?
Integrated Concepts (a) An immersion heater utilizing 120 V can raise the temperature of a 1.00 102 -g aluminum cup containing 350 g of water from 20.0°C to 95.0°C in 2.00 min. Find its resistance, assuming it is constant during the process. (b) A lower resistance would shorten the heating time. Discuss the practical limits to speeding the heating by lowering the resistance.
Check Your Understanding Some strings of miniature holiday lights are made to short out when a bulb bums out. The device that causes the short is called a shunt, which allows current to flow around the open circuit. A “short” is like putting a piece of wire across the component. The bulbs are usually grouped in series of nine bulbs. If too many bulbs bum out, the shunts eventually open. What causes this?
Integrated Concepts A 160F capacitor charged to 450 V is discharged through a 31.2-k resistor. (a) Find the time constant. (b) Calculate the temperature increase of the resistor, given that its mass is 2.50 g and its specific heat is 1.67kJkgC' noting that most of the thermal energy is retained in the short time of the discharge, (c) Calculate the new resistance, assuming it is pure carbon, (d) Does this change in resistance seem significant?
The label or a portable radio recommends the use of rechargeable nickel-cadmium cells (nicads), although they have a 1.25-V emf while alkaline cells have a 1.58-V emf. The radio has a 3.20- resistance, (a) Draw a circuit diagram ot the radio and its batteries. Now, calculate the power delivered to the radio, (b) When using Nicad cells each having an internal resistance of 0.0400O. (c) When using alkaline cells each having an internal resistance of 0.200 . (d) Does this difference seem significant, considering that the radio s effective resistance is lowered when its volume is turned up?
Consider the circuit shown in the preceding problem. Write equations for the power supplied by the voltage sources and the power dissipated by the resistors in terms
Is a circuit breaker wired (a) in series with the device it is protecting, (b) in parallel, or (c) neither in series or in parallel, or (d) is it impossible to tell?
Find the current through a person and identify the likely effect on her if she touches a 120-V AC source: (a) if she is standing on a rubber mat and offers a total resistance of 300 k; (b) if she is standing barefoot on wet grass and has a resistance of only 4000 k .
Consider the circuit shown in Figure P18.10. (a) Calculate the equivalent resistance of the 10.0- and 5.00- resistors connected in parallel. (b) Using the result of part (a), calculate the combined resistance of the 10.0-, 5.00-, and 4.00- resistors. (c) Calculate the equivalent resistance of the combined resistance found in part (b) and the parallel 3.00- resistor. (d) Combine the equivalent resistance found in part (c) with the 2.00- resistor. (e) Calculate the total current in the circuit. (f) What is the voltage drop across the 2.00- resistor? (g) Subtracting the result of part (f) from the battery voltage, find the voltage across the 3.00- resistor. (h) Calculate the current in the 3.00- resistor. Figure P18.10