Fundamentals of Electricity

One MWHR is equivalent to___________.

The heat required to raise 1 gram of water at 1 degree Celsius.

An electric heater develops a power of 1 kW when run on a 230 V supply. If the heater resistance wire has a diameter of 0.5 mm and a resistivity of \(60 \times 10^{-8}\) Ω-m, find the minimum length of the wire required.

A material best suited for manufacturing of fuse wire is

The resistance of a copper wire at 30°C is 50 Ω. If the temperature coefficient of copper at 0°C is 0.00427, what is the resistance at 100°C?

A constant current of 2 A flows through a circuit element. In 10 seconds, how much net charge passes through the element?

Compute the resistance of a copper wire having a diameter of 2.05 mm and a length of 10 m.

What is \(10^{13}\) ergs/sec in kW?

One kwhr is equal to_____ BTU.

When the length of a wire is doubled and all other factors remained the same, what would the wire resistance become?

An aluminum wire has a diameter of 2 mm. What must be the diameter of copper wire of the same resistance and length as aluminum?

A 220-V bulb draws a current of 10 A. How much charge in kilocoulombs will pass through the bulb in a two-hour period?

\(7.1 \times 10^{10}\) BTU is equal to______ Gcal.

The resistance of a coil of wire increases from 40 Ω at 10°C to 48.25 Ω at 60°C. Find the temperature coefficient at 0°C of the conductor material.

A substance that contains atoms with several bands of electrons but with only one valence electron is

What is the resistance of 2,000 m of copper wire that has a resistivity of \(1.72 \times 10^{-8}\) Ω·m and a diameter of 4 mm?

A coulomb

The power required to produce a gain of 10dB over 4 w of original power is

An ion

Wavelength is the distance travelled by an electromagnetic wave during the time of one cycle. Given a wavelength of 12 meters, what is the frequency?