Electric Circuits Answers

When resistance of 2 ohm is connected across the terminals of the cell the current is 0.5 A and when the resistance is increased to 5 ohm the current is 0.25 A. The emf of the cell is ?

a capacitance of 20uf and a resistance of 10052 are connected in series across a 120v, 60Hz, if the capacitive reactance is 13352. find the impedance of the circuit. b). what is the magnitude of the circuit current? c). calculate the potential difference across the capacitor.

A transformer with a primary of 400 turns is connected across a 120v a-c line. the secondary circuit has a potential difference of 300v. the secondary 0.06a and the primary current is 1.85a. how many turns are in the secondary winding? b). what is the transformer efficiency?

A coaxial cable consists of a solid inner conductor of radius a =0.2 m carrying total current of 5A, surrounded by a concentric cylindrical tube of inner radius b=0.4 m and outer radius c=0.6m carrying current of 5A. The conductors carry equal and opposite currents I distributed uniformly across their cross-sections. Determine the magnetic field at a distance r=0.5m from the axis.  (10p)

Calculate the instantaneous power of an ac circuit that has a maximum voltage of 240v and a maximum current of 0.24A with a phase angle of 30 degrees.

a pair of adjacent coils has a mutual inductance of 1.06h. determine the average emf induced in the secondary circuit when the current in the primary circuit changes to 9.5A in 0.0336s

A coaxial cable consists of a solid inner conductor of radius a =0.2 m carrying total current of  5A, surrounded by a concentric cylindrical tube of inner radius b=0.4 m and outer radius c=0.6m carrying current of 5A. The conductors carry equal and opposite currents I distributed uniformly across their cross-sections. Determine the magnetic field at a distance r=0.5m from the axis.

a man uses a 900w electric iron to press his cloth for an average of 4 hours a week for 5 weeks . if the cost of electrical energy is 30 kobo per unit , calculate the cost of energy for pressing

One ampere

An electrical heater of 10W is drawing a current of 5 A, calculate the total voltage across the heater