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- Current, Voltage and Resistance
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- 2. Outline Electric current Voltage and resistance Electrical power Dr. Basil Hamed IUG
- 3. A. Electric Current The photo on the opposite page shows a simple electric circuit (or circuit).
- 4. A. Electric Current Current- measured in amperes, or amps (A) -is the rate of flow of
- 5. B. Voltage and Resistance The amount of current (in amps) flowing through a circuit will partly
- 6. B. Voltage and Resistance Materials with very high resistance, such as plastics, are called electrical insulators
- 7. C. Electrical Power The text below, about electrical power, is from a home improvements magazine The
- 8. 43.1 Complete the word puzzle and find the word going down the page. Look at A,
- 9. 43.1 Complete the word puzzle and find the word going down the page. Look at A,
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Outline
Electric current
Voltage and resistance
Electrical power
Dr. Basil Hamed IUG
Outline
Electric current
Voltage and resistance
Electrical power
Dr. Basil Hamed IUG
A. Electric Current
The photo on the opposite page shows a simple
A. Electric Current
The photo on the opposite page shows a simple
Dr. Basil Hamed IUG
an electrical supply - in this case, the cell
an electrical conductor (or conductor)- an electrical path- in this case, wires
one or more electrical components (or components)- electrical devices (in this case, the lamp) which have a function.
A. Electric Current
Current- measured in amperes, or amps (A) -is the
A. Electric Current
Current- measured in amperes, or amps (A) -is the
Notes: In everyday English, cells are called batteries. In technical English, a battery is a number of cells placed together. Lamps are often called bulbs in everyday English .
Dr. Basil Hamed IUG
B. Voltage and Resistance
The amount of current (in amps) flowing through
B. Voltage and Resistance
The amount of current (in amps) flowing through
The amount of current will also depend on electrical resistance (or resistance). This value- in ohms (0) - is a measure of how easily current can flow through the conductors and components in a circuit. For example, a lamp creates resistance because the filament- the metal wire inside it - is very thin. This limits the amount of current that can flow. Resistance also depends on the materials used as conductors. For example, copper has a low resistance and so is a good conductor.
Dr. Basil Hamed IUG
B. Voltage and Resistance
Materials with very high resistance, such as plastics,
B. Voltage and Resistance
Materials with very high resistance, such as plastics,
Dr. Basil Hamed IUG
C. Electrical Power
The text below, about electrical power, is from a
C. Electrical Power
The text below, about electrical power, is from a
The amount of current, in amps, required by an electrical appliance- such as a TV or an electric kettle -depends on the power of the appliance. This number- expressed in watts (W)- will be marked somewhere on the appliance. To calculate the required current, simply take the wattage and divide it by the voltage of the electrical supply in your home- around 230 volts in most of Europe. Therefore, for an electric kettle with a power rating of 2,000 watts (as specified by the manufacturer), the current required is:
Dr. Basil Hamed IUG
43.1 Complete the word puzzle and find the word going down
43.1 Complete the word puzzle and find the word going down
1 another term for amperage
2 provided by a battery, for example
3 measured as a wattage
4 allows current to flow through it
5 has very high electrical resistance
6 carried by moving electrons
7 another term for an electrical 'device'
8 the consequence of a person touching a live conductor
Dr. Basil Hamed IUG
43.1 Complete the word puzzle and find the word going down
43.1 Complete the word puzzle and find the word going down
Dr. Basil Hamed IUG