#### Transcript What are amps, watts, volts, and ohms?

```What are amps, watts, volts,
and ohms?
Three most basic units in
electricity:
• Voltage
• Current
• Resistance
• Voltage is measured in volts
• Current is measured in amps
• Resistance is measured in ohms
Electrical system Vs. Plumbing
System
• Voltage is equivalent to water pressure
• Current is equivalent to the flow rate
• Resistance is like the pipe size
• Current (amps) = Volts / Resistance
• A=V/R
• If you want more electricity to come out of
the wire, then either increase the pressure,
or make the wires bigger
• Increasing the voltage will make more
current flow
Im rick james
• Power consumed by the resistance in
electrical wires increases as the current
going through the wires increases
• Using higher voltage to reduce the current
can make electrical systems more efficient
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Wattage = Electrical Power
Watts = Volts * Amps
W = VA
Electrical power = Voltage * Current
P = VI
• 1,000 watts = 1 Kilowatt
• Kilowatt-hours = Usage of 1 kilowatt for
one hour
• 1,000 watt-hours = 1 kilowatt hour
Improvement in Efficiency
• Carmakers are moving toward a 42-volt
electrical system from the current 12-volt
systems.
• This change will help cars meet the
greater electrical demand placed on them
without having to increase the size of the
wires and generators to handle the greater
current
```