Questions from College Physics

Q: If a current of 80.0 mA exists in a metal

If a current of 80.0 mA exists in a metal wire, (a) How many electrons flow past a given cross section of the wire in 10.0 min? (b) In what direction do the electrons travel with respect to the curren...

Q: An electric heater carries a current of 13.5 A when

An electric heater carries a current of 13.5 A when operating at a voltage of 1.20 x 102 V. What is the resistance of the heater?

Q: A voltmeter connected across the terminals of a tungsten - filament light

A voltmeter connected across the terminals of a tungsten - filament light bulb measures 115 V when an ammeter in line with the bulb registers a current of 0.522 A. (a) Find the resistance of the light...

Q: Germanium is a semiconducting metal with a resistivity of 0.460

Germanium is a semiconducting metal with a resistivity of 0.460 Ω · m. (a) Determine the current per unit area through a 5.00 - V germanium junction with a length of 2.00 mm. (b) Find the current thro...

Q: A person notices a mild shock if the current along a path

A person notices a mild shock if the current along a path through the thumb and index finger exceeds 80. μA. Compare the maximum possible voltage without shock across the thumb and index finger with a...

Q: Suppose you wish to fabricate a uniform wire out of 1.

Suppose you wish to fabricate a uniform wire out of 1.00 g of copper. If the wire is to have a resistance R = 0.500 Ω, and if all the copper is to be used, what will be (a) The length and (b) The diam...

Q: Nichrome wire of cross - sectional radius 0.791 mm is

Nichrome wire of cross - sectional radius 0.791 mm is to be used in winding a heating coil. If the coil must carry a current of 9.25 A when a voltage of 1.20 x 102 V is applied across its ends, find (...

Q: A wire of diameter 0.800 mm and length 25.

A wire of diameter 0.800 mm and length 25.0 m has a measured resistance of 1.60 Ω. What is the resistivity of the wire?

Q: A potential difference of 12 V is found to produce a current

A potential difference of 12 V is found to produce a current of 0.40 A in a 3.2 - m length of wire with a uniform radius of 0.40 cm. What is (a) The resistance of the wire? (b) The resistivity of the...

Q: The current supplied by a battery in a portable device is typically

The current supplied by a battery in a portable device is typically 0.15 A. Find the number of electrons passing through the device in one hour.