# Circuits

Flashcards by Gretta Mildred, updated more than 1 year ago
 Created by Gretta Mildred almost 6 years ago
6
1

### Description

GCSE Physics Flashcards on Circuits, created by Gretta Mildred on 05/04/2015.

## Resource summary

 Question Answer What is this? The cell What is this? An open switch What is this? A closed switch What is this? A lamp/ filament lamp What is this? A battery What is this? A voltmeter what is this? Resistor What is this? Fuse What is this? An ammeter What is this? A variable resitor What is this? Thermistor What is this? Light-dependent resistor What is this? Light emitting diode What is this? A diode What has to be put in series? An ammeter What has to be connected in parallel? A voltmeter Resistors and current The current through a resistor is directly proportional to potential difference. Different resistors have different resistances Filament lamp in relation to resistance? As the temperature of the filament increases, the resistance increases, hence the curved graph. Diode and resistance Current will only flow through a diode in one direction. The diode has very high resistance in the opposite direction 1. Why does resistance increase with temperature? 1. When an electrical charge flows through a resistor, some of the electrical energy is transferred to heat energy- resistor gets hot 2. Why does resistance increase with temperature? This heat energy causes the ions in the conductor to vibrate more 3.Why does resistance increase with temperature? This makes it more difficult for the charge-carrying electrons to get through the resistor- the current can't flow as easily- resistance increases 4.Why does resistance increase with temperature? For most resistors, there is a limit to the amount of current that can flow. More current means an increase in temperature, which means an increase in resistance, which means the current decreases again What is a diode used for? Made of semiconductor material e.g. silicon. Regulates the potential difference in circuits What is a light-emitting diode used for? LEDs emit light when a current flows through it in the FORWARD direction. Use smaller current. Indicate presence of current in a circuit. What are light- dependent resistors used for? They are dependent on the intensity of light. Bright light= resistance falls, darkness= high resistance What is a thermistor? Temperature-dependent resistor. HOT conditions= resistance DROPS, COOL conditions = resistance INCREASES In series circuits, potential difference is..? SHARED In series circuits, current is.. THE SAME EVERYWHERE In series circuits, resistance..? ADDS UP In series circuits, cell voltages..? ADD UP In parallel circuits, potential difference is..? THE SAME ACROSS ALL COMPONENTS In parallel circuits, the current is...? SHARED- total current flowing is equal to the total of all the currents through the separate components What is the voltage of UK mains supply? 230 volts What is the UK mains supply- alternating or direct current? Alternating current- 50Hz What is AC? Alternating current- current constantly changes direction What is DC? DC- used by cells and batteries, current always flows in THE SAME DIRECTION

### Similar

Using GoConqr to study science
GCSE AQA Physics - Unit 3
AQA Physics P1 Quiz
GCSE AQA Physics 1 Energy & Efficiency
Waves
Forces and their effects
Junior Cert Physics formulas
Forces and motion
OCR Physics P4 Revision