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Combined Science: Physics

GCSE · Edexcel · foundation

QuestionsFlashcards

Expressing Quantities & SI Units
- Units & Prefixes
  8
- Conversions & Standard Form
  6

Atomic Structure
Radioactive Decay
Dangers of Radiation
- Dangers of Radiation
  5
- Contamination & Irradiation
  6

Magnetism
Electromagnetism & The Motor Effect
- Magnetic Fields in Wires
  6
- Magnetic Fields in Solenoids
  6

Transformers & the National Grid
- The National Grid
  5
- The Ideal Transformer Equation
  3

Electrical Components Flashcards

All 6 cards in this deck

What shape is the current–potential difference graph for a fixed resistor at constant temperature, and what does it show about resistance?: A straight line through the origin; the resistance is constant.
What shape is the current–potential difference graph for a filament lamp, and what does it show about resistance?: A curve that gets shallower as the current increases; the resistance increases because the filament gets hotter.
What does the current–potential difference graph for a diode look like?: Almost no current one way (very high resistance), and current rising steeply once the forward p.d. is reached.
How does the resistance of a light-dependent resistor (LDR) vary with light intensity?: The resistance decreases as the light intensity increases (high resistance in the dark).
What is the difference between a linear and a non-linear component?: A linear component has a straight-line current–potential difference graph (e.g. a fixed resistor); a non-linear component has a curved one (e.g. a filament lamp).
Give an everyday use of a light-dependent resistor (LDR).: A light sensor, e.g. in street lights or security lights that switch on automatically when it gets dark.