Electric Circuits Answers

Two resistor R and X connected parallel.The ammeter reads a current of 3A,when R is 5ohms, and 6A when R 2A.Determine the value of X

In a common emitter transistor amplifier the load resistance is 5000ohm and input resistance is 1000ohm. If the peak value of input signal voltage is 10mv peak value of output voltage is (beta=100)

A current of 350 mA flows through a gold wire with a diameter of 1.0 mm and a length of 25 cm. There are 5.90 x 1028 free electrons/m3in a gold. 

A) What is the current density in the wire?

B) What is the magnitude of the drift velocity of the free electrons in the wire?

A point charge of 5 µC is located at point A between two plates 40 cm apart. The potential of the upper plate is 1000 V and the lower plate is at zero. The geometry of the situation is shown in Figure 7.4. Calculate the force on the charge when it is at A.

A shunt motor is running off a 220 – V supply taking an armature current of 15A, the resistance of the armature circuit being 0.8Ω. Calculate the value of the generated e.m.f. If the flux were suddenly reduced by 10 per cent, to what value would the armature current increase momentarily

R1 = 6 ohm

R2 = 5 ohm

R3 = 4 ohm

R4 = 4 ohm

R5 = 8 ohm

with 10V

Solve for the voltage across resistor #5 (R5)?

Each circuit ________________ has a different resistance

Research practical applications of voltage divider circuits.

Explain the essential requirement of a

1) voltmeter and

2) ammeter with respect to their resistance

B) explain with circuit diagram how you can construct a multimeter

If the resistor are in parallel,prove also that the equivalent resistance is R where

1/R=1/R1 +1/R2 +1/R3+...1/RN