Physics Current Electricity Level: High School
10.0 m wire consists of 5.0 m of copper followed by 5.0 m of aluminum of equal diameter (both 1.0 mm) . A voltage difference of 80V is placed across the composite wire .(a) What is the total resistance of the wire ?
(b) What is the current flow through the wire ?
(b) What is the voltage across the aluminum part and across the copper part ?
Physics Current Electricity Level: High School
A rectangular solid made of carbon has sides lying along the x,y and z axes. Whose lengths are 1.0 cm. 2.0 cm. and 4.0 cm , respectively (see the figre at “click here”) . Determine the resistance for current that flows through the solid in(a) the x direction,
(b) the y direction
(c) the z direction
Assume the resistivity is p = 3.0 x 10^-5 ohm.m.
Physics Current Electricity Level: High School
A 100-W light bulb has a resistance of about 12 ohm When cold ( 20 degreeC) and 140 ohm when on (hot) . Estimate the temperature of the filament when”on “ assuming an average temperature coefficient of resistivity ‘infinite’ = 0.0060 (Cdegree)^-1 .
Physics Current Electricity Level: High School
Estimate at what temperature copper will have the same resistivity as tungsten does at 20 degreeC ?
Physics Current Electricity Level: High School
A length of aluminum wire is connected to a precision 10.00 V power supply , and a current of 0.4212 A is precisely measured at 20.0 degreeC. The wire is placed in a new environment of unknown temperature where the measured current is 0.3618A . What is the unknown temperature ?
Physics Current Electricity Level: High School
A bird stands on and electric transmission line carrying 2500 A (figure at “click here” ) . The line has 2.5 x 10^-5 ohm resistance per meter and the bird’s feet are 4.0 cm apart . What voltage does the bird feel ?
Physics Current Electricity Level: High School
Can copper wire and aluminum wire of the same length have the same resistance ? Explain ?
Physics Current Electricity Level: High School
When an electric cell is connected to a circuit , electrons flow away from the negative terminals in the circuit . But within the cell, electrons flow to the negative terminals . Explain ?
Physics Alternating Current Level: High School
Draw a vector diagram for the circuit shown in figure at “click here” . Show the condition of the power supply angular frequency W for each of the following cases to occur .(1) Current I leads to voltage E
(2) Current I lags voltage E.
(3) Current I is zero
Physics Alternating Current Level: High School
In the circuit shown in Figure at “click here” in each of the following cases , does the current I lead or lag the voltage E ?(1) VL > VC
(2) VL < VC
Physics Alternating Current Level: High School
A 6V peak sine wave is riding a DC voltage of 8V . If the DC voltage is lowered to 5V how far negative will the sine wave go ?
Physics Alternating Current Level: High School
A sine wave with an rms value of 10.6V is riding on a level of 24 V . What are the maximum and minimum values of the resulting waveform ?
Physics Alternating Current Level: High School
For a 0 degree reference sine wave with an rms value 6.37 determine the instantaneous value at pi/8 rad, pi/4 rad , pi/2rad , 3pi/4rad , pi/rad , 3pi/rad , 2pi rad .
Physics Alternating Current Level: High School
A certain wave has a positive going zero crossing at 0 degrees and an rms value of 20V , Calculate its instantaneous value of each: 15 degrees , 33 , 50 , 110 , 70, 145 , 250 , 325 degrees .
Physics Alternating Current Level: High School
One sine wave has a positive peak at 75 degrees and another positive peak at 100 degrees . How much each sine wave shifted in phase from the 0 degree reference ? What was the phase angle in them?