10 Questions
What does the 4th color band on a general purpose carbon film resistor indicate?
The resistor's tolerance
How is the value of a resistor determined using the first three bands in the color code system?
The first two bands determine the value, and the third band determines the multiplier for the first two digits
If a resistor has color bands of Red, Red, Orange, Gold, what is the value of this resistor in Ohms?
2200 Ohms
What does a silver 4th color band on a resistor indicate?
10% tolerance
What does the 3rd color band in the resistor color code system determine?
The multiplier for the first two digits
What is the unit of current?
Amperes
How is current related to the quantity of electrons flowing through a point in the circuit?
Direct relationship
What is the formula for Ohm's Law?
$V = IR$
What does the symbol Omega represent in the context of electronics?
Resistance
If the voltage in a circuit is 12V and the resistance is 4 Ohms, what is the current in the circuit?
3 A
Study Notes
Resistor Color Code
- The 4th color band on a general purpose carbon film resistor indicates the tolerance (percentage of accuracy) of the resistor's value.
Determining Resistor Value
- The value of a resistor is determined using the first three bands in the color code system, where:
- The 1st band represents the 1st significant figure
- The 2nd band represents the 2nd significant figure
- The 3rd band represents the multiplier (power of 10)
Resistor Example
- A resistor with color bands of Red, Red, Orange, Gold has a value of 22000 Ohms with a tolerance of ±5%
Tolerance
- A silver 4th color band on a resistor indicates a tolerance of ±10%
Multiplier
- The 3rd color band in the resistor color code system determines the multiplier (power of 10) of the resistor's value
Unit of Current
- The unit of current is the Ampere (A)
Current and Electron Flow
- Current is related to the quantity of electrons flowing through a point in the circuit, with 1 Ampere being equivalent to 1 Coulomb per second
Ohm's Law
- The formula for Ohm's Law is I = V/R, where I is current, V is voltage, and R is resistance
Omega Symbol
- The symbol Ω (Omega) represents Ohms, the unit of resistance
Circuit Example
- If the voltage in a circuit is 12V and the resistance is 4 Ohms, the current in the circuit is 3A (using Ohm's Law: I = V/R = 12V/4Ω = 3A)
Test your knowledge of resistor color codes with this worksheet. Practice identifying the values and tolerances of general purpose carbon film resistors based on their color bands.
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