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Ohm's law
Ohm’s law is a prominent concept in physics and electronics. It gives the relation between the current and the voltage. It is used to analyze and construct electrical circuits. Ohm's law states that the voltage across a conductor is directly proportional to the current flowing through it.
Path of Least Resistance
In a series of alternate pathways, the direction of least resistance is the actual or metaphorical route that offers the least resistance to forwarding motion by a given individual or body.
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- A 9V battery is placed across a 180 Ω resistor. How much current flows thru the resistor ? How much power does it use ?You measure the power delivered by a battery to be 1.05 W when it is connected in series with two equal resistors. How much power will the same battery deliver if the resistors are now connected in parallel across it?WA 160F capacitor charged to 450 V is dischargedthrough a 31.2k 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 1.67kJ/kg °C,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?
- Consider a resistor made from a hollow cylinder of carbon as shown below. The inner radius of the cylinder is Ri= 0.20 mm and the outer radius is R0 = 0.30 mm. The length of the resistor is L = 0.90 mm. The resistivity of the carbon is =3.5105 m. (a) Prove that theresistance perpendicular from the axis is R=2L1n(R0Ri) . (b) What is the resistance?What is the current in the element of an electric clothes dryer with a resistance of 7.4 Ω when it is connected to 240 V? Express your answer to two significant figures and include the appropriate units. I= How much charge passes through the element in 50 min? (Assume direct current.) Express your answer to two significant figures and include the appropriate units. Q=What is the output voltage of a 3.00-V lithium cell in a digital wristwatch that draws 0.660 mA, if the cell's internal resistance is 2.15 Ω? (Enter your answer to at least five significant figures.)V
- Lightbulb A is marked “25.0 W 120. V,” and lightbulb B ismarked “100. W 120. V.” These labels mean that each lightbulbhas its respective power delivered to it when it is connected toa constant 120. - V source. (a) Find the resistance of each lightbulb.(b) During what time interval does 1.00 C pass into lightbulbA? (c) Is this charge different upon its exit versus its entryinto the lightbulb? Explain. (d) In what time interval does1.00 J pass into lightbulb A? (e) By what mechanisms does thisenergy enter and exit the lightbulb? Explain. (f ) Find the costof running lightbulb A continuously for 30.0 days, assumingthe electric company sells its product at $0.110 per kWh.A portable coffee heater supplies a potential difference of 12.0 V across a Nichrome heating element with a resistance of 1.67 Ω. (a). Calculate the power (in W) consumed by the heater. (b) How many minutes would it take to heat 1.43 kg of coffee from 20.6°C to 45.2°C with this heater? Coffee has a specific heat of 4184 J/(kg*C°). Neglect any energy losses to the environment.A 220 V potential difference is maintained across an electric heater that is made from a nichrome wire of resistance 20. a. ) Find the current in the wire and the power rating of the heater. b. ) At an estimated price of 0.85 LE ( Egyptian pound ) per kilowatt - hour of electricity , what is the cost of operating the heater for 3hr? (Answer A and b please. This is not graded)
- consider a portable electric blanket that runs on a 4,5 V battery. ıf you use copper wire with a 0,75 mm diameteras the heating element, how long should the wire be (in units of meters) if you want to generate 20 W of heating power ?(take the resistivity of the copper wire as p = 1,7 * 10-8 ohm*m)Hi, can you help me to understand this problem by helping me through STEP BY STEP solution. The answer is given in the photo that i provide and here is the problemDetermine the resistance of a 1-mile length of 12-gauge copper wire. Given: 1 mile = 1609 meters and diameter = 0.2117 cm.Find the equivalent resistance between terminals a and b for each of the networks shown in Figure P2.6.