Circuits

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