Unit 2 - Circuits/Revision Flashcards
(15 cards)
What is projectile motion?
Motion of an object under the influence of gravity.
What causes the vertical acceleration in projectile motion?
The force of gravity.
What is the value of gravitational acceleration on Earth?
9.8 m/s².
What is the initial vertical velocity of a horizontally launched projectile?
0 m/s.
Is the horizontal speed of a projectile constant?
Yes, assuming air resistance is negligible.
What is the function of a diode in a circuit?
A diode allows current to flow in one direction only, preventing reverse current.
How does a thermistor’s resistance change with temperature?
A thermistor’s resistance increases as the temperature decreases.
What does an LDR (Light Dependent Resistor) do?
An LDR’s resistance decreases as light intensity increases.
What is the purpose of a capacitor in electronic circuits?
A capacitor stores electrical energy and is used in timing circuits and amplifiers.
What is a voltage divider used for?
A voltage divider creates a specific voltage output from a higher input voltage, often used to provide input to other components.
How does a transistor function as a switch?
A transistor acts as a switch by allowing current to flow when a certain input voltage is applied, turning ‘on’ or ‘off’ a circuit.
What is the role of a fuse in a circuit?
A fuse protects a circuit by melting and breaking the connection if the current exceeds a safe level.
What happens to the total resistance when resistors are added in series?
The total resistance increases, equal to the sum of individual resistances.
What happens to the total resistance when resistors are added in parallel?
The total resistance decreases and is less than the smallest individual resistor.
What is the effect of increasing the length of a wire on its resistance?
Increasing the length of a wire increases its resistance proportionally.
