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How many electrons pass through a conductor in 3 milliseconds if the current is 5mA?
A balanced star load having an impedance of (20 – j30) Ω in each phase is supplied by a star-connected generator with line voltage of 400 V, 50 Hz. What is the total active power?
a)an isolated conducting sphere of 10cm placed in a vacuum carried a positive charge of 1.0×10^-10coulombs calculate it's electrical intensity.
b)the p.d in volts at the surface of the sphere and 5m from the sphere respectfully.
Deduce the dimensional formula for modulus of elasticity(Y).
(a) ML-1T-2
(b) ML-3T-2
(c) ML-2T-2
(d) ML-1T-3
a potential difference of 10v causes a current of 5a to flow through a lamp. if the bulb is switched on for 20 seconds, how much energy is transferred ?
A balanced three phase load has per phase impendance of 25+j40 ohms if 400v three phase supply is connected to the load determine the
Phase current
Line current
Power factor
Power supplied to the load
A tungsten filament lamp has a resistance of 11.8 ohms at 20 degrees Celsius. Determine its resistance at 2500 degrees Celsius
A silver wire has a resistance of 40 ohms at 19 degrees Celsius. After several hours of heating, the resistance of the coil has increased to 60 ohms. What is the new temperature of the wire?
Determine the length of an aluminum wires that has a resistance of 158 milliohms and a diameter of 0.113. Resistivity of aluminum = 2.83x10^-8
l=
How long will it take for 4x10^16 electrons to pass a point in a conductor, if the current is 1500 micro amps.
t=
