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physics electricity
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Electricity is produced by ___
Electric current which requires power source and wires
Series and Parallel circuits
Series
current flow is the same
single loop
Parallel
current flow may be different,
current flowing through each branch is lower than the current from source
Current
Rate of flow of electric charge
measured in A amperes using a ammeter must be connected in a series
recorded to 2 decimal places
V/R= I (current = voltage/resistance).
Voltage
amount of energy needed to move one unit charge of electricity
measured in volts (V) using voltmeter
must be in a parallel circuit
recorded to 2 decimal places
V= R/ I ( resistance/ current = voltage).
resistance
resist the flow of current
in ohms Ω
V / I = R (voltage / current = resistance).
total resistance in series
R
T
= R
1
+R
2
+R
3
...
Total resistance in parallel
Power
P= voltage*current
measured in watts
Electrical energy
electrical energy= power (watts) * time (seconds)
or voltage* current * time
Measured in joules J
energy consumed and Cost of electricity
1000W = 1kW
energy consumed(kWh) = power(kilowatt/ kW)* time(hour)
Cost = energy consumed(kWh) * cost per unit
Hazards
Frayed wire - insulation torn. Electric shock
Overloading - Fire
using wet appliances - Electric shock
why is fuse near the live wire?
live wire is of high voltage. if it goes over the voltage, the fuse will melt, thus it will be a open circuit with no electric current flowing
Chemical effects
electrolysis
electroplating
electrolysis
decomposition of compound by an electric current
used to break down water into hydrogen and oxygen
oxygen at positive and hydrogen at negative
electroplating
used to coat an object with a thin layer of material usually metal so that appearances are improved or to protect it from corrosion
material is at positive
Author
nicolehwj
ID
38413
Card Set
physics electricity
Description
physics electricity
Updated
2010-09-29T17:46:46Z
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