Deck 11: Electromagnetic Induction

Question 1

Determine the delta-connected equivalent network for the star-connected impedances shown in Figure RT11.1.

Figure RT11.1

Answer 1

Question 2

Transform the delta-connection in Figure RT11.2 to its equivalent star connection. Hence determine for the network shown in Figure RT11.3, (a) the total circuit impedance, (b) the current I, (c) the current in the 20  resistor, and (d) the power dissipated in the 20  resistor

Answer 2

Question 3

If the load impedance Z in Figure RT11.4 consists of variable resistance and variable reactance, find (a) the value of Z that results in maximum power transfer, and (b) the value of the maximum power.
Figure RT11.4

Answer 3

Question 4

Determine the value of the load resistance R in Figure RT11.5 that gives maximum power dissipation and calculate the value of power.
Figure RT11.5

Question 5

An a.c. source of 100 V and internal resistance 5 k is matched to a load for maximum power transfer by a 5:1 ideal transformer. Determine (a) the value of the load resistance, and (b) the power dissipated in the load.