Ohm's Law, Resistors, Tolerance, Conversions, Calculations

Which equation is Ohm's Law?

V = I × R

Which equation calculates resistance?

R = V ÷ I

A 12 V source is connected across 600 Ω. What is the current?

0.02 A

Which equation calculates current?

I = V ÷ R

A resistor drops 6 V while carrying 0.02 A. What is its resistance?

300 Ω

What does the prefix kilo mean?

1,000 (10³)

Current is 5 mA through a 2 kΩ resistor. What is the voltage drop?

10V (0.005A × 2000Ω= 10V)

What tolerance does a gold fourth band represent?

±5%

Which resistor band is normally read last?

Tolerance band

What is the unit of electrical resistance?

Ohm

How is a resistor connected to an ohmmeter for measurement?

Across the isolated resistor with power off

The first color band represents:

first significant digit

The third band on a four-band resistor is usually the:

Multiplier

If current decreases while voltage stays constant, resistance has:

Increased

If voltage increases while resistance stays constant, current:

Increases

What tolerance is represented by a silver band?

±10%

Tolerance Brown

±1%

Tolerance Black

0

Tolerance Red

±1%

Tolerance Orange

±0.05%

Tolerance Yellow

±0.02%

Tolerance Green

±0.5%

Tolerance Blue

±0.25%

Tolerance Violet

Tolerance Gray

Tolerance Gold

Tolerance Silver

Tolerance None