Use the following Word Bank to complete the sentence by inserting the correct words in the spaces: Resistors the flow of current through a .

Here are the answers to your questions:

3.5

• Resistors control the flow of current through a circuit.
• Resistance is measured in Ohms ($\Omega$).
• When resistance is high, the flow of current is small.
• When resistance is low, the flow of current is large.

3.6 To indicate a resistance of $4700 \, \Omega$ with a $5\%$ tolerance, the color bands on the fixed resistor would be:

• First band: Yellow (for digit 4)
• Second band: Violet (for digit 7)
• Third band: Red (for multiplier $10^2$, or 100)
• Fourth band: Gold (for $5\%$ tolerance)

6.1 Four examples of when it would be useful to have a device that detects the amount of light and does something in response to it are:

• Automatic street lights that turn on when it gets dark and turn off when it's light.
• Security systems that trigger an alarm if a beam of light is broken or if ambient light changes unexpectedly.
• Automatic garden lights that illuminate pathways or features at night.
• Automatic dimming of car headlights or dashboard lights based on ambient light conditions.

6.2 The role of the LDR (Light-Dependent Resistor) in a circuit is to detect changes in light intensity. Its resistance decreases as the light intensity falling on it increases, and its resistance increases as the light intensity decreases. This change in resistance can then be used to control other components in the circuit, such as turning lights on or off, or adjusting brightness.

6.3 The symbol for a Light-dependent resistor (LDR) is typically represented as a standard resistor symbol (a zigzag line or a rectangle) enclosed in a circle, with two arrows pointing towards it, indicating incident light.

Send me the next one 📸