Direct Current

Question 1

When using the superposition theorem, what happens to the sources?

Answer 1

Voltage source -> short circuit

Current source -> open circuit

Question 2

What is the difference between Thevenin and Norton circuits?

Answer 2

Thevenin: voltage source and resistor in series
Norton: current source and resistor in parallel

Question 3

When is the maximum power dissipated?

Answer 3

When the load resistance is equal to the internal resistance

Question 4

In a delta circuit where Ra is opposite point 1, how do you find R1 for the Wye circuit?

Answer 4

R1=(Rb*Rc)/(Ra+Rb+Rc)

Question 5

When converting a Wye circuit to a delta circuit, how do you find the resistor opposite point 1?

Answer 5

Ra = (R1R2 + R2R3 + R3R1)/R1

Question 6

How must current be defined in mesh analysis?

Answer 6

All currents defined in the same direction even if this is known to be untrue in reality

Question 7

If the current as defined in mesh analysis reaches the negative terminal of the voltage source first, how doors this affect the calculation?

Answer 7

The voltage is subtracted rather than added

Question 8

What is a Wheatstone bridge?

Answer 8

A square of resistors with a detector across the middle diagonal

Question 9

What is output current of a Wheatstone bridge is balanced?

Answer 9

0

Question 10

What is the resistance of any resistor in a balanced Wheatstone bridge?

Answer 10

The product of the two adjacent resistors divided by the opposite resistor