Circuit Theory

Question 1

What’s a source?

Answer 1

Something that turns a physical property into a signal

Question 2

What is a load?

Answer 2

Something that converts electrical power into another source. (i.e motor)

Question 3

What’s conventional current?

Answer 3

Charge flows from positive to negative terminal (this is worng tho, but its just historic)

Question 4

How to determine that power is being supplied? (P is -ve)

Answer 4

When current leaves the high voltage side of the element

Question 5

How to tell if power is absorbed?

Answer 5

When current enters the high voltage side of the element

Question 6

What is an ideal voltage source?

Answer 6

Assumed constant p.d regardless of current. (battery or power suply)

Question 7

What is a ideal current source?

Answer 7

Constant current regardless of voltage.

Question 8

Resistor power dissapation formulas?

Answer 8

P= IV
P= I^2R
P=V^2/R

Question 9

How does power interact with resistors? (wrong english but you get what i mean)

Answer 9

Resistor always absorbs power

Question 10

When a resistor is in a basic circuit what direction does the high voltage go?

Answer 10

Towards the resistor

Question 11

What is a branch?

Answer 11

A part of a circuit with only one element

Question 12

What is a node?

Answer 12

A connection point of branches

Question 13

What’s a loop?

Answer 13

Any closed path around the circuit

Question 14

What are meshes (type of loop)

Answer 14

Loops that dont cut any branches

Question 15

What’s kirchoff’s current law?

Answer 15

At any node the algebraic sum of the current is = 0
ΣI = 0

Question 16

What’s Kirchoff’s voltage law?

Answer 16

At any instant the algebaic sum of the v oltages of a loop is 0
ΣV=0

Question 17

What is the equation for inverting op amps?

Answer 17

A = -R2 / R1 = V out / V supplied