Physics - Electricity

Charge
1. When a charge is placed near a charged object, it will experiance a force.
2. 1C=1As-1
Conductors
1. Metals, carbon
Insulators
1. Glass, plastic, wood
current is the flow of electrons
1. 1A= 1Cs-1
Voltage is the amount of electrical energy given to electrons by the battery
1. 1V=1JC-1
Resistance is material opposes current
2. V=IR
3. The higher the resistance the smaller the current
Series circuit
1. The current is the same at different positions
2. Vs=V1+V2+V3
3. Rt=R1+R2+R3
Parallel circuit
1. I=I1+I2+I3
2. The voltage across the resistors is the same
3. 1/Rt=1/R1+1/R2+1/R3
Changes energy into electrical energy
1. Microphone
2. Thermocouple
3. Solar cell
4. Thermistor
5. LDR
Changes electrical energy into different energy
1. Loudspeaker
2. Motor
3. Lamp
4. LED
A capacitor is a device which can store charge
Transistors
1. MOSFET
  1. Turns on at 2V
2. NPN
  1. Turns on at 0.7 V
Power is the change of energy over time
1. Mains supply is 230V
2. P=E/T
  1. 1W=1J/S
AC is current that travels in both directions
1. 50HZ in Britain
  1. Current changes direction 50 times per second
Direct current is when current flows in one direction
R1/R2=V1/V2
conduction is heat transfer in solids
convection- liquids and gases
Work done is when energy changes into another form of energy
1. Ew=Fxd
Pessure is the force an object exerts over an area
1. P=F/a
P1/T1=P2/T2
P1V1=P2V2

Resource summary

	Created by dana-howbridge over 9 years ago