6008

Physics Current & Electricity Level: Misc Level

A small motor draws a current of 1.75 A from a 120 V line. The output of power of the motor is .20 hp. At a rate of .60/kwh, what is the cost of operating the motor for 4 hours?


6006

Physics Current & Electricity Level: Misc Level

The output of power of the suun is (4.0x10^26W).Calculate @ 8 cents per kilowatt per hour the cost of runing the sun for one second.


6005

Physics Current & Electricity Level: Misc Level

A lightbulb has a tungsten filament with a resistance of of 19 ohm,s when cold and 140 ohm,s when hot. Find the temperature if the filament when it is hot.


6004

Physics Current & Electricity Level: Misc Level

A length of Lo copper wire has a resistance Ro. The wire is cut into three piecesof equal legnth. The pieces arre then connected as parrellel legnths between points A and B.What resistance will this new wire Lo/3 have?


6003

Physics Current & Electricity Level: Misc Level

If .00325 kg gold is deposited on the negative electrode of an electrolytic cell in a period of 2.78 hours, what is the current through the cell in this period. Assume that the gold ions carry one elementary unit of positive charge.


5875

Physics Current & Electricity Level: Misc Level

A transformer has 384 primary turns and 1.32 E3 secondary turns. The input voltage is 1.20 E2 V and the output current is 15.0 A.what is the output voltage? what is the input current?


5874

Physics Current & Electricity Level: Misc Level

A  transformer is designed to change 1.20 E2 V into 1.00 E4 V,and there are 119 turns in the primary coil. How many turns are in the secondary coil? Answer 100% efficiency.turns


5865

Physics Current & Electricity Level: Misc Level

If the restoring spring of a galvanometer weakens by 18% over the years, what current will give full -scale deflection if it originally required 36:A?


5855

Physics Current & Electricity Level: Misc Level

If you plug an electric toaster rated at 110 V into a 220-V outlet, the current in the toaster will be about a. half what it should be b. the same as if it were plugged into 110 V. c. twice what it should be d. more than twice what it should be


5409

Physics Current & Electricity Level: Misc Level

An isolated 4.70 uF parallel -plate capacitor has 2.70 mC of charge. An external force changes the distance between the electrodes until the capcitance is 3.00 uF. How much work is done by the external force?


5407

Physics Current & Electricity Level: Misc Level

A 3.00- cm diameter parallel- plate capacitor with a spacing of 0.300 mm is charged to 400 V. What is the total energy stored in the electric field? What is energy density?


5404

Physics Current & Electricity Level: Misc Level

How much work does the charge do to move 2.10 uC of charge from the negative terminal to the positive terminal of a 2.50 V battery?


5342

Physics Current & Electricity Level: Misc Level

In the figure  R1 =81 Q, R2=67 Q, and the ideal batteries have emfs E1 =8.0 V, E2 =5.0 V, and E3 =4.0 V. Find (a) the current in R1, (b) the current in R2, and (c) the potential difference between points a and b.


5341

Physics Current & Electricity Level: Misc Level

In Fig.what does the ammeter read if E=6.5 V (ideal battery), R1=2.0 Q, R2=3.3 Q, and R3=5.1 Q? (b) The ammeter and battery are now interchanged. Determine the ammeter reading for this new configuration.


5327

Physics Current & Electricity Level: Misc Level

The current in a single -loop circuit with one resistance R is 4.2 A. When an additional resistance of 2.4 Q is inserted in series with R, the current drops to 2.9 A. What is R?


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