Real-Life Examples of Resistors in Circuits

📚 Quick Study Guide

• 💡 Resistors limit current flow in a circuit.
• 📏 Resistance is measured in ohms ($\Omega$).
• 🌈 Ohm's Law: $V = IR$, where $V$ is voltage, $I$ is current, and $R$ is resistance.
• 🔥 Resistors dissipate electrical energy as heat.
• 🧪 Resistors come in various types: carbon film, metal film, wirewound.
• 💻 Resistors are used everywhere from computers to toasters.
• 🛠️ Color codes on resistors indicate their resistance value.

Practice Quiz

1. Which of the following is a common application of resistors in circuits?
   • A) Amplifying voltage
   • B) Limiting current
   • C) Storing charge
   • D) Generating power
2. What does Ohm's Law state?
   • A) $E = mc^2$
   • B) $V = IR$
   • C) $P = VI$
   • D) $F = ma$
3. A resistor has color bands: Brown, Black, Red, Gold. What is its resistance?
   • A) 100 $\Omega$ ±5%
   • B) 1 k$\Omega$ ±5%
   • C) 10 k$\Omega$ ±5%
   • D) 10 $\Omega$ ±5%
4. In a simple LED circuit, what is the primary purpose of a resistor?
   • A) To increase the LED's brightness
   • B) To limit the current through the LED
   • C) To decrease the voltage supplied to the LED
   • D) To stabilize the temperature of the LED
5. Which type of resistor is commonly used for high-power applications?
   • A) Carbon film resistor
   • B) Metal film resistor
   • C) Wirewound resistor
   • D) Variable resistor
6. What happens to the power dissipated by a resistor if the current through it doubles?
   • A) It halves
   • B) It doubles
   • C) It quadruples
   • D) It remains the same
7. A 5$\Omega$ resistor has a voltage of 10V across it. What is the current flowing through it?
   • A) 0.5A
   • B) 2A
   • C) 5A
   • D) 50A