Physics Current & Electricity Level: Misc Level

A certain brand of hot dot cooker applies a potential difference (120V) to opposite ends of the hot dog and cooks by means of the joule heat produced. If 60 kJ is needed to cook each hot dog. what current is needed to cook four hot dogs simultaneously in 3.0 minutes?

a. 11A

b. 2.8 A

c. 8.3 A

d. 2.1 A

e. 3.6 A

Physics Current & Electricity Level: Misc Level

Most telephone cables are made of copper wire of either 24 or 26 gauge.If the resistance of 24-gauge wire is 137 Q/mile and the resistance of 26- gauge wire is 220 Q/mile, what is the ratio of the diameter of 24- gauge wire to that of 26- gauge wire?

a. 1.6

b.1.3

c. 0.62

d. 0.79

e. 0.88

Physics Current & Electricity Level: Misc Level

A capacitor of unknown capacitance C is charged to 100 V and then connected across an initially uncharged 60-uF capacitor. If the final potential difference across the 60-uF capacitor is 40 V, determineC.

a. 49 uF

b. 32 uF

c. 40 uF

d. 90 uF

e. 16 uF

Physics Current & Electricity Level: Misc Level

An RLC series circuit consists of a 15 uF capacitor, a 78.0 Q resistor and a 90 mH inductor.The oscillator is set for 560 Hz outputs a sinusoidal ] voltage of 105 V. Determine the:

a) current flowing in the circuit

b)voltage drop across each of the circuit elementts.

Physics Current & Electricity Level: Misc Level

Determine the capacitance and the maximum voltage that can be applied to a Teflon-filled parallel -plate capacitor having a plate area of 1.75 cm squared and insulation thickness of 0.040 mm.

Physics Current & Electricity Level: Misc Level

Suppose that you wish to fabricate a uniform wire out of 1.0 gram of copper. If the wire is to have a resistance of R 0.50 ohms, and all of the copper is to be used, what will be the length and diameter of this wire?

Physics Current & Electricity Level: Misc Level

The turns ratio inside a transformer is 13:1 and is used with a 120V. If the transformer draws 0.350 A what is the voltage and current supplied from the transformer and how much power is delivered?

Physics Current & Electricity Level: Misc Level

A resonant circuit in a radio receiver is tuned to a station when the inductor has a value of .200 mH and the capacitor has a value of 30.0 pF. Find frequency and wavelength sent out by the station.

Physics Current & Electricity Level: Misc Level

In centain RLC circuit, the rms current is 6.0 A, rms voltage is 240 V and the current leads the voltage by 53 degrees. What is the total resistance of the circuit? Calculate the total reactance X(L)-X(C) and find the average power delivered to the circuit.

Physics Current & Electricity Level: Misc Level

A 50 ohm resistor is connected in series to a 15.0 micro Farraday capacitor and a 60.0 herz, 120 v source.Find the current and value of the inductor that must be inserted in the circuit to reduce this same current to 1/2.

Physics Current & Electricity Level: Misc Level

An ac voltage source has an output of delta V=150 sin 377t. Find the rms voltage output and frequency of the source.Find the voltage at t=1/120 sec. Find the maximum current in the circuit when the generator is connected to a 50.0 ohm resistor.

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?

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.

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.

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?