Classroom visuals
Film info
Film summary
Power loss affects electricity supply, especially to homes far from power stations. Why is power lost, and how is electricity effectively transported over long distances?Key facts
- Direct current flows in a single direction.
- Alternating current switches direction back and forth.
- Power = current x voltage.
- Transformers are used in power lines to change the voltage.
Transcript
The relationship between power, voltage and current is vital to the way electricity is supplied to our homes.
Power (P) = Current (I) x Voltage (V)
The higher the current or voltage, the more power is available.
When electricity was first produced commercially in the late 19th century, the current flowed in a …
Please log in to view and download the complete transcript.
