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Cellular Energy Conversion

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Questions and Answers

What role do cells play in converting chemical energy?

Cells convert chemical energy into electrical energy, enabling the movement of charges.

Define electrical potential difference and its unit of measurement.

Electrical potential difference, also known as voltage, is the energy needed to move one unit of charge between terminals, measured in volts.

Differentiate between direct current (DC) and alternating current (AC).

DC is characterized by the flow of current in a single direction, while AC alternates its direction periodically.

What is the unit of electric current and how is it expressed in smaller units?

<p>The unit of electric current is amperes (A), and it can be expressed in smaller units as milliamperes (mA), where 1A = 1000mA.</p> Signup and view all the answers

What is the typical electrical potential difference for household outlets in Canada and the USA?

<p>Most household outlets in Canada and the USA are rated at 120V.</p> Signup and view all the answers

Study Notes

Electrical Energy and Cells

Cells provide energy by separating charges
Electrical potential difference (voltage) is the energy needed to move a charge from one point to another
A difference is used because it measures the difference in electrical potential (Ep) per unit of charge
Cells, batteries, and electrical outlets have a voltage difference between their terminals
Household outlets in Canada and the USA are usually 120V, some appliances require 240V
Electric current is the rate of movement or flow of charges
Direct current (DC) flows in one direction from a cell
Alternating current (AC) changes direction repeatedly

Electric Current

Current is measured in amperes (A)
A smaller unit is milliamperes (mA), 1A = 1000mA

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Description

This quiz explores the crucial role of cells in the conversion of chemical energy into usable forms. Understand how cellular processes such as respiration and metabolism facilitate this energy transformation within living organisms.