OCR Gateway P6 Revision 3.0 / 5 based on 1 rating ? PhysicsElectricityGCSEOCR Created by: charlotteCreated on: 17-06-13 13:00 what is current? flow of charged particles 1 of 14 what is voltage? amount of energy particles have 2 of 14 what is resistance? a materials opposition to the flow of electrons 3 of 14 ohms law voltage is directly proportional to current 4 of 14 light dependent resistor (LDR).. a ldr is designed to change it's resistance depending on how much light is shone upon it, it has a very high resistance 5 of 14 what are LDR's used in? automatic sun blinds & outdoor lighting, digital clock display 6 of 14 resistance in LDR's as light increases, resistance decreases (resistance is inversely proportional to light) 7 of 14 thermistors are designed to.. change their resistance depending on the temperature of surroundings 8 of 14 thermistors are used in.. thermostats, fire alarms, refrigerators & light bulbs 9 of 14 resistance in thermistor as temperature drops, resistance increases 10 of 14 potential dividers.. consist of a pair of resistors, they divide the voltage in a circuit. the higher the resistance the bigger the voltage drop 11 of 14 what is a magnetic field? a region here magnetic materials experience a force acting on them 12 of 14 to get a bigger voltage.. increase strength of magnet, no. of turns & speed of movement 13 of 14 logic gates (AND, OR, NOT, NAND & NOR) AND- only input if both are on. OR - input if one is on. NOT - input opposite (1 = 0) NAND - opposite input to AND. NOR - opposite to OR 14 of 14
Comments
No comments have yet been made