PHYSICS 2 ASSESSMENT Flashcards
What is the primary function of a diode?
A diode primarily allows current to flow in one direction only.
True or False: A variable resistor can change its resistance.
True
What does LED stand for?
LED stands for Light Emitting Diode.
Fill in the blank: A _____ is used to protect circuits from excessive current.
fuse
What is a thermistor used for?
A thermistor is used to measure temperature changes.
True or False: An LDR is a light-dependent resistor.
True
What happens to the resistance of a thermistor as temperature increases?
The resistance decreases as temperature increases.
Multiple Choice: Which component emits light when current passes through it? A) Diode B) LED C) Variable Resistor D) Fuse
B) LED
What is the main characteristic of a fuse?
A fuse is designed to stop the circuit when the current exceeds a certain level.
Fill in the blank: An LDR’s resistance decreases in _____ light.
bright
What does a variable resistor do?
changes the amount of resistance in a circuit
True or False: Diodes can be used for rectification in circuits.
True
What is the function of a fuse in an electrical circuit?
To protect the circuit from overcurrent.
Multiple Choice: Which device is commonly used in temperature sensing applications? A) LED B) Thermistor C) Diode D) Fuse
B) Thermistor
What does a light-dependent resistor (LDR) do?
An LDR changes its resistance based on the intensity of light.
Fill in the blank: A diode has a forward bias and a _____ bias.
reverse
True or False: Variable resistors are also known as potentiometers.
True
What is the typical use of an LED in circuits?
Emits light when current flows through it.
Multiple Choice: Which component can be used to control the brightness of a light? A) Diode B) Fuse C) Variable Resistor D) Thermistor
C) Variable Resistor
What type of current does a diode allow to pass?
Direct current (DC)
Fill in the blank: A _____ resistor is sensitive to temperature changes.
thermistor
True or False: An LDR can be used in automatic street lighting systems.
True
What happens to the current in a circuit when a fuse blows?
The current is interrupted and stops flowing.
What is the primary difference between a thermistor and a regular resistor?
A thermistor’s resistance changes significantly with temperature, while a regular resistor’s resistance remains constant.
Multiple Choice: What happens to the resistance of an LDR in darkness? A) Increases B) Decreases C) Remains the same D) Fluctuates
A) Increases
why do metals such as copper, zinc or tin conduct electricity?
because they are transition metals and i between the ions they have a sea of delocalised electrons which can carry charge.
Charge Flow =
Current x Time
Electric charge is?
a fundamental property of matter everywhere.
Electrical power is?
filling the modern world with artificial light and sound and entertainment.
