Question Bank by Edumentors
From 11+, GCSEs to A-Levels and beyond - free study notes that students all across the UK use
What are the common mistakes students make when drawing force diagrams and ray diagrams in A-Level Physics?
Force and ray diagrams require precise construction and complete labeling to earn full marks in A-Level Physics. Step-by-Step Solution: Force diagrams must show all forces as arrows proportional to their magnitude, starting from the point of application Label each force with both magnitude (in Newtons) and directio
Explain the concept of internal resistance in a power supply and how it affects the terminal potential difference.
Internal resistance (r) is the opposition to current flow within a power supply itself, causing the terminal potential difference (V) to be less than the EMF (ε) according to the equation: V = ε - Ir Step-by-Step Solution: Internal resistance exists due to the physical components within the power supply (e.g., batte
Describe Simple Harmonic Motion (SHM) and identify the conditions required for an object to undergo SHM.
Simple Harmonic Motion is oscillatory motion where the restoring force is directly proportional to displacement from equilibrium position and acts in the opposite direction (-kx). Step-by-Step Solution: Conditions for SHM: 1. Restoring force ∝ -displacement (F = -kx) 2. Motion must be about a fixed equilibrium pos
How do capacitors work, and what is their role in storing electrical energy in a circuit?
A capacitor stores electrical energy by accumulating opposite charges on two parallel conducting plates separated by an insulator (dielectric), creating a potential difference. Step-by-Step Solution: When connected to a voltage source, electrons flow to one plate (negative) while electrons are removed from the other
Explain how the properties of a semiconductor can prevent an LED from lighting up in a circuit.
An LED can fail to light up due to three key semiconductor properties: incorrect polarity (reverse bias), insufficient forward voltage to overcome the band gap, or excessive reverse voltage causing breakdown. Step-by-Step Solution: In reverse bias, electrons cannot cross p-n junction as depletion layer widens, preve
Download our free study tips
This handbook will help you plan your study time, beat procrastination, memorise the info and get your notes in order.
Need help to find a tutor?
Our educational experts will help you find the perfect online tutor from top UK universities.