4900

Physics Current & Electricity Level: Misc Level

An extension cord made of two wires of diameter 0.129 cm (no. 16 copper wire) and of length 2.7 m (9.0 ft) is connected to an electric heater which draws 10.0 A on a 1.2 E 2-V line. How much power is dissipated in the cord?


4899

Physics Current & Electricity Level: Misc Level

At $0. 071 per kWh, what does it cost to leave a 1.0 E 2 -W porch light on day and night for a year?


4898

Physics Current & Electricity Level: Misc Level

What is the maximum voltage that can be applied across a 7.3 -k? resistor rated at 1 /4 watt?

Enter your answer with 2 significant digits.


4896

Physics Current & Electricity Level: Misc Level

Calculate the ratio of the resistance of 22.0 m of aluminum wire 2.5 mm in diameter, to 16.0 m of copper wire 1.8 mm in diameter.

Enter the ratio as a decimal.


4894

Physics Current & Electricity Level: Misc Level

What voltage will produce 0.30 A of current through a 4.6 E 3 resistor?


4893

Physics Current & Electricity Level: Misc Level

A current of 2.30 A flows in a wire. How many electrons are flowing past any poin in the wire per second?


4889

Physics Current & Electricity Level: Misc Level

A 9.0 ohms resistor and a 6.0 ohms resistor are connected in a series with a power supply. (a) the voltage drop across the 6.0 ohms resistor is measured to be 12 V. Find the voltage output of the power supply. (b)The two resistors are connected in parallel across a power supply, and the current through the 9 ohms resistor is found to be.25 A. Find the voltage setting of the power supply.


4887

Physics Current & Electricity Level: Misc Level

At 40.0 C, the resistance of a segment of a segment of gold wire is 100.0 Ohms. When the wire is placed in a liquid bath, the resistance decreases to 97.0 Ohms. What is the temperature of the bath?


4886

Physics Current & Electricity Level: Misc Level

If a silver wire has a resistance of 10.0 ohms at 20.0 C what resistance does it have at 40.0 C? Neglect any change in length or cross -sectional area resulting from the change in temperature?


4883

Physics Current & Electricity Level: Misc Level

(a). How much charge is on each plate of a 4.00 - uF capacitor when it is connect to a 12. V battery (b) If this same capacitor is connected to a 1.50 V battery, what charge is stored?


4882

Physics Current & Electricity Level: Misc Level

A 1- megabit computer memory chip contains many 60.0 x 10 -15 F Capacitors. Each capacitor has a plate area of 21.0 x 10 - 12 m 2. Determine the plate separation of such a capacitor ( assume parallel plate configuration) The diamater of an atom is on the order of 10-10 m =1 A. Express the plate separation in angstroms.


4846

Physics Current & Electricity Level: Misc Level

Can a particle ever move from a region of low electric potential to one of high potential and yet have its electric potential energy decrease? Explain.


4845

Physics Current & Electricity Level: Misc Level

State clearly the difference between : a) electric potential and electric field. b) electric potential and electric potential energy.


4787

Physics Current & Electricity Level: Misc Level

An L R C circuit has L = 27.1 m H and R =8.50?.

a. What value must C have to produce resonnance at 4.00 E3 Hz?

b. What will be the maximum current at resonance if the peak external voltage is 1.8 E 2 V?


4785

Physics Current & Electricity Level: Misc Level

What is the resistance of a coil if its impedance is 335 ? and its reactance is 145 ??


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