ISCET DC Circuits Fundamentals 5

Question 1

What is the color code for a resistor with bands: brown, black, red, gold?

Accepted Answer

1kΩ ±5%

Answer

Brown=1, Black=0, Red=×100 multiplier, Gold=±5% tolerance: 10 × 100 = 1000Ω = 1kΩ ±5%.

Question 2

An open circuit condition in a series circuit causes:

Accepted Answer

Zero current through the entire circuit

Answer

An open break in a series circuit stops all current flow since there is no complete path for current.

Question 3

What is the voltage across an open-circuit branch in a parallel circuit if the source is 15V?

Accepted Answer

15V

Answer

All branches in a parallel circuit share the same voltage as the source; the open branch still has the full 15V across it.

Question 4

Doubling the length of a wire while keeping diameter constant will:

Accepted Answer

Double its resistance

Answer

Resistance R = ρL/A; doubling L while keeping A constant doubles resistance.

Question 5

Which of the following correctly states Kirchhoff's Voltage Law (KVL)?

Accepted Answer

The sum of all voltage drops around a closed loop equals the sum of voltage sources

Answer

KVL states that the algebraic sum of all voltages around any closed loop is zero, meaning source EMFs equal the total of voltage drops.

(ISCET) International Society of Certified Electronics Technicians Practice Test