MYP Physics 3.9 Generation and Transmission of Electricity Questionbank

Why do power grids utilize pumped hydroelectric storage despite the inherent energy losses involved in the pumping process?

An ideal step-up transformer at a power station is used to prepare electricity for long-distance transmission. The transformer receives $60\ \text{MW}$ of electrical power from the generator at a primary voltage of $12\ \text{kV}$. The voltage is then increased to $300\ \text{kV}$ for the transmission cables. What is the current flowing in the transmission cables?

Thermal $\rightarrow$ Chemical $\rightarrow$ Mechanical $\rightarrow$ Electrical

Chemical $\rightarrow$ Electrical $\rightarrow$ Kinetic $\rightarrow$ Thermal

Chemical $\rightarrow$ Thermal $\rightarrow$ Kinetic $\rightarrow$ Electrical

Kinetic $\rightarrow$ Thermal $\rightarrow$ Chemical $\rightarrow$ Electrical

True

False

Electrical energy $\rightarrow$ Potential energy

Chemical energy $\rightarrow$ Nuclear energy

Potential energy $\rightarrow$ Kinetic energy $\rightarrow$ Electrical energy

Solar energy $\rightarrow$ Chemical energy

To convert electrical energy into nuclear energy

To eliminate the need for transmission cables

To balance electricity supply with varying consumer demand

To increase the total amount of energy available on Earth

$0.005\ \text{A}$

$5000\ \text{A}$

$200\ \text{A}$

$1.8\times 10^{13}\ \text{A}$