7576

Physics Current Electricity Level: Misc Level

Nichrome wire is used in some radiative heaters. a) find the resistance neeeded if the average power output is to be 1.00 kW utilizing 120VAC. b) What length of nichrome wire having a cross section area of 5.00 mm^2 is needed if the operating temp is 500 deg C. C)what power will it draw when first turned on?


7575

Physics Current Electricity Level: Misc Level

A resistor made of Nichrome wire is used in an application where its resistance cannot change more than 1.00% from its value at 20.0 deg c. Over what temp range can it be used? (nichrome resistivity=100*10^-8)


7574

Physics Current Electricity Level: Misc Level

Find the voltage drop in an extension cord having a 0.0600 OHM resistance and through which 5.00 Amp is flowing. b) A chepaer cord utilizes a thinner wire and has a resistance of 0.300 ohm what is the voltage drop in it when 5.00 Amp flow.


7571

Physics Current Electricity Level: Misc Level

An electric heater is basically a wire through which the electric current flows.What is the resistance of such a heater if its power is 1000W and its is used in a regular home so that the voltage is 110V.


7570

Physics Current Electricity Level: Misc Level

Suppose a room has two 100-watt light bulbs. How much is the electricity bill per month (30 days) if the light bulbs are all you are  paying for and they are used everyday 4 hours per day? The electricity cost is 15 cents per k Wh.


7543

Physics Current Electricity Level: Misc Level

How much current will flow through the 8.0 Q resistor?

a.1.0A

b.0.29 A

c.0.50 A

d.2.0 A

e.None of the other responses


7542

Physics Current Electricity Level: Misc Level

In a certain DC circuit, 1.50 A of current flows through a 4.00 Q metal resistor for a period of 90.0 s. During this time interval, what is the net number of electrons that have passed through a cross-section of the resistor?

a.135

b.8.43x1020

c.3.37x1021

d.1.04x1017

e.5.06x1021


7541

Physics Current Electricity Level: Misc Level

For the circuit shown, what is the magnitude of the potential difference across the 6.00 Q resistor?

a.4.50 V

b.3.60 V

c.6.00 V

d.6.75 V

e.1.80 V


7436

Physics Current Electricity Level: Misc Level

Which one of the following situations results in a conventional electric current that flows westward?

(a) a beam of protons moves eastward?

(b) an electric dipole moves westward

(c) a beam of electrons moves westward

(d) a beam of electrons moves eastward

(e) a beam of neutral atoms moves westward


7395

Physics Current Electricity Level: Misc Level

The current through a certain heater wire is found to be fairly independent of its temperature. If the current through the heater wire is doubled, the amount of energy delivered by the heater in a given time interval will

(a)increase by a factor of two<----my answer

(b) decrease by a factor of two

(c) increase by a factor of four

(d) decrease by a factor of four

(e) increase by a factor of eight


7370

Physics Current Electricity Level: Misc Level

If R1= R2=R3, what is the voltage across each resistor in terms of V battery?


7369

Physics Current Electricity Level: Misc Level

If you have a 7 ohm resistor hooked up to a battery 9 V battery, how much current will flow through the resistor?How many electrons will flow through the resistor in one minute?


7368

Physics Current Electricity Level: Misc Level

One company advertises that their holiday lights will stay lit if one bulb goes out, and another company with cheaper lights does not make this claim. What specifically is different about the way the two light strands are wired?Draw a picture of how the bulbs are connected together (think about series and parallel circuits).


7320

Physics Current Electricity Level: Misc Level

What is the current in a 60.0 W bulb when connected to a 120- V emf?


7319

Physics Current Electricity Level: Misc Level

What is the resistance between points A and B in the following?


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