Physics 7.3.7 Flashcards
The 3 Main Roles of Transformers: (3)
-Used to Increase Voltage/PD of Electricity, Before it is Transmitted Across the National Grid.
-Used to Lower the High Voltage/PD Electricity Used in Power Lines, to the Lower Voltages Used in Houses, for Safety (230V).
-Used in Adapters, to Lower Mains Voltage to the Lower Voltages Used by Many Electronic Devices.
What is the Disadvantage of Electricity Travelling Long Distances?
When Electricity is Transmitted Over Large Distances, the Current in the Wires Heats them, Resulting in Energy Loss.
How can Energy be Lost from Electricity Travelling Long Distances?
When Electricity is Transmitted Over Large Distances, the Current in the Wires Heats them, Resulting in Energy Loss.
In Order to Transmit the Same Amount of Power as the Input Power, the Voltage/PD at which the Electricity is Transmitted Should be ___. This will Result in a ___ Current being Transmitted Through the Power Lines. Why is this?
Increased. Smaller. This is Because P=IV, so if V Increases, I Must Decrease, in order to Transmit the Same Power.
How can we Reduce the Amount of Energy Dissipated / Wasted / Lost from Electricity Travelling Long Distances?
We can Decrease the Current Flowing Through the Wires. A Smaller Current Flowing Through the Power Lines Results in Less Heat being Produced in the Wire. Hence, this will Reduce the Total Energy Dissipated / Wasted / Lost as Heat Energy, to the Surroundings, as Heat Energy.
