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- How much electrical energy (in kilojoules) is transferred to thermal energy in 2.90 hours by an electrical resistance of 384 ohms when the potential applied across it is 91 volts? Express your final answers to four decimal places.An uncharged condenser in series a 120-volt voltmeter of 10,000 ohms resistance is suddenly connected to a 100 V battery. One second later, the voltmeter reads 60 volts. Determine the rate at which the voltage across the condenser is charging. Answer.: 51e – 0.51t volts/sec.When a light bulb is connected to a 6 V battery, a current of 0.32 A passes through the light bulb. What is the resistance (in Ω) of the filament [round your final answer to zero decimal places]?
- A piece of Nichrome wire has a radius of 5.0x 104 m. It is used in a laboratory to make a heater that dissipates 4.00x102W of power when connected to a voltage source of 150 V. Ignoring the effect of temperature on resistance, estimate the necessary length of wire. Number UnitsA toaster is rated at 80.0 W, when connected to a 132.0-V source. What current (in amperes) does the toaster carry? Round your answer to the nearest hundredth of an ampere.A 240V household appliance has an electrical resistance of 209 Ohms. How much energy will it use in 63.1 seconds. Express your answer in kilojoules to at least 3 significant figures.
- We are going to use a microwave oven, a toaster, and a refrigerator. The equivalent resistance of the kitchen circuit is 6 ohms. When all thee devices are in use, the fuse breaks if the current reaches 25A. Will the fuse blow?Calculate the current through a 10.0 m long nichrome wire with a diameter of 0.642 mm if it is connected across a 12.0 V battery. The resistivity of the nichrome is 1.00 × 10^-6 Ω ∙ m. Hint: Ohm's Law after you calculate the resistance. Standard units!What is the output voltage (in V) of a 3.0000 V lithium cell in a digital wristwatch that draws 0.340 mA, if the cell's internal resistance is 1.90 Ω?
- How much current flows thru a 6 Ω resistor in 4 minutes if it is connected to a 9V battery ?Four 2.2 V cells are connected in series to a 8.0 light bulb. If the resulting current is 0.75 A, what is the internal resistance (in Q) of each cell, assuming they are identical and neglecting the resistance of the wires?A dry cell with an emf of 1.50V and an internal resistance of 0.050 ohms is "shorted out" with a piece of wire with a resistance of only 0.20 ohms. What will a voltmeter read if it is connected to the terminals of the dry cell at this time?