Three Phase
Resistive Loads
Attempt the questions below then scan the QR code to see a worked solution and
check your answers.
1. Three identical resistive loads of 25Ω are connected in star to a 415V supply,
calculate the phase voltage, the line current and the phase current.
2. The same loads of 25Ω are now connected in delta to a 415V supply,
calculate the phase voltage, the line current and the phase current.
3. Three identical resistive loads of 50Ω are connected in star to a 400V supply,
calculate the phase voltage, the line current and the phase current.
4. The same loads of 50Ω are connected in delta to a 400V supply, calculate the
phase voltage, the line current and the phase current.
5. Three identical resistive loads of 220Ω are connected in star to a 440V supply,
calculate the phase voltage, the line current and the phase current.
6. The same loads of 220Ω are connected in delta to a 440V supply, calculate
the phase voltage, the line current and the phase current.