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Questions and Answers
What does the 4th color band on a general purpose carbon film resistor indicate?
What does the 4th color band on a general purpose carbon film resistor indicate?
How is the value of a resistor determined using the first three bands in the color code system?
How is the value of a resistor determined using the first three bands in the color code system?
If a resistor has color bands of Red, Red, Orange, Gold, what is the value of this resistor in Ohms?
If a resistor has color bands of Red, Red, Orange, Gold, what is the value of this resistor in Ohms?
What does a silver 4th color band on a resistor indicate?
What does a silver 4th color band on a resistor indicate?
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What does the 3rd color band in the resistor color code system determine?
What does the 3rd color band in the resistor color code system determine?
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What is the unit of current?
What is the unit of current?
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How is current related to the quantity of electrons flowing through a point in the circuit?
How is current related to the quantity of electrons flowing through a point in the circuit?
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What is the formula for Ohm's Law?
What is the formula for Ohm's Law?
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What does the symbol Omega represent in the context of electronics?
What does the symbol Omega represent in the context of electronics?
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If the voltage in a circuit is 12V and the resistance is 4 Ohms, what is the current in the circuit?
If the voltage in a circuit is 12V and the resistance is 4 Ohms, what is the current in the circuit?
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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)
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Description
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.
