{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

10W-quiz-1-sol

# 10W-quiz-1-sol - ECE102(Winter 2010 Quiz 1 Problem 1 Find v...

This preview shows pages 1–2. Sign up to view the full content.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: ECE102 (Winter 2010), Quiz 1 Problem 1. Find v x in the circuit below (5 pts).- + V x V x V 1 +- 1A 10V 20 10 20 10V Using Node voltage Method (see circuit): Node: v 1 v 1 − 10 20 + v 1 − 20 + v 1 − v x 10 = 0 v 1 − 10 + v 1 + 2 v 1 − 2 v x = 0 → 2 v 1 − v x = 5 Node: v x + v x − v 1 10 − 1 = 0 → − v 1 + v x = 10 Solving the above two equations in two unknowns ( v 1 and v x ), gives v x = 25 V.- + V x +- 1A 10 B A 10 5V 1A Alternative Method: We can replace the subcircuit of the 10-V supply and two 20 Ω resistors with its Thevenin equivalent between pints A and B (see circuit) with R T = 20 bardbl 20 = 10 Ω and V T = (20 / 40) × 10 = 5 V. Note that this combination of a voltage source and two resistors appear frequently in biasing transistors. Then, by KCL, a current of 1 A should flow in the circuit (see circuit) and by KVL, +20 i + 5 − v x = 0 or v x = 25 V Problem 2. In the circuit below, with a fully discharged capacitor at t → −∞ , switch S is closed at...
View Full Document

{[ snackBarMessage ]}

### Page1 / 2

10W-quiz-1-sol - ECE102(Winter 2010 Quiz 1 Problem 1 Find v...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online