Resistance Flashcards
(13 cards)
1
Q
Conducting wire
A
Metal, power source and complete circuit, electrons to positive terminal
2
Q
Resistance
A
Opposes passage of electrons, measured in ohms
3
Q
Resistor
A
Electrical component which adds resistance to a circuit
4
Q
Electrons moving through conductor
A
Collide with particles of which conductor is made, transfer kinetic energy, resistance, heats up
5
Q
Uses of resistors
A
- control current
* useful energy transfers
6
Q
Kettle
A
Metal coil, heating element, large resistor, electrons move through resistor, release energy, electrical to heat
7
Q
Incandescent
A
- filament
- lights up
- inneficient
8
Q
Light bulb
A
Filament, tungsten, high resistance, electrical to light
9
Q
Rheostats
A
- variable resistance
- adjust current
- dimmer switches, speed of motors
10
Q
Resistance works according to
A
Inverse proportion
11
Q
LED
A
- light emitting diode
- one direction
- sensitive , large resistor
12
Q
Factors that affect resistance
A
- material
- length
- thickness
- temp.
13
Q
In metals electrons are
A
Able to move freely, delocalised
