# physics electricity

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1. Electricity is produced by ___
Electric current which requires power source and wires
2. 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
3. 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).
4. 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).
5. resistance
• resist the flow of current
• in ohms Ω
• V / I = R (voltage / current = resistance).

• total resistance in series
• RT= R1+R2+R3...

• Total resistance in parallel
• 6. Power
• P= voltage*current
• measured in watts
7. Electrical energy
• electrical energy= power (watts) * time (seconds)
• or voltage* current * time
• Measured in joules J
8. energy consumed and Cost of electricity
• 1000W = 1kW
• energy consumed(kWh) = power(kilowatt/ kW)* time(hour)
• Cost = energy consumed(kWh) * cost per unit
9. Hazards
Frayed wire - insulation torn. Electric shock

using wet appliances - Electric shock
10. 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
11. 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 Updated: 2010-09-29 17:46:46 Tags: physics electricity Folders: Description: physics electricity Show Answers: