Voltage
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Lessons
- Finding Voltage in Series Configuration
Calculate the total voltage drops across the resistors in this circuit. Explain how Kirchhoff's 2nd Rule applies here. - Finding Voltage in Parallel Configuration
Find the missing voltage drops across the two resistors in parallel (R2 and R3). - Finding Voltage in BOTH Series & Parallel Configurations
Find the missing voltages across resistors (voltage drops) for R2, R3, and R5. (Assume that R3= R5). - Finding Voltage across Resistors and at Certain Points in More Complex Circuits
- Finding Voltage in More Complex Circuits
Find the missing voltages at each point and across each resistor (voltage drops).
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Topic Notes
In this lesson, we will learn:
- What is an electric circuit and what are the main components: battery (voltage), closed wire path (current), and devices/resistors that use up electricity (resistance)?
- How to draw a schematic diagram using simplified symbols to represent a circuit.
- How to tell the difference between series vs. parallel configurations for resistors in a circuit.
- What is a battery and how does it provide voltage for an electric circuit?
- What is voltage?
- Kirchhoff’s 2nd Rule: Loop Rule for solving voltage questions
- Voltage in parallel rule: the voltage used in parallel settings are EQUAL
Notes:
- An electric circuit is a closed loop that electric charge flows within; circuits contain 3 main components:
- (1) a source of electrical energy (battery)
- (2) a complete pathway for electric charges to flow through (wire), and
- (3) one or more devices that use up electricity (electronics, resistors).
- A schematic diagram is a simplified drawing of an electric circuit which uses universal symbols for each component of an electric circuit. A battery’s (+) positive terminal is drawn as a longer line whereas its (-) negative terminal is drawn as a shorter line.
- The conventional current is the flow of positive charge, starting from the battery’s (+) positive terminal, travelling through the entire circuit, and ending at the (-) negative terminal.
- An electric circuit’s attached electronic devices (lightbulbs or resistors) can be connected in either series or parallel configurations.
- Series: resistors are connected in series if they are in a single and continuous path
- Parallel: resistors are connected in parallel if they are in multiple, branching paths
- A battery provides voltage to an electric circuit; it drives the electricity throughout the circuit.
- A battery converts chemical energy into electrical energy; the reduction-oxidation reaction that occurs within the battery generates excess free energy which is put into the circuit as electrical energy.
- Voltage is a type of electrical potential difference. The voltage of a battery represents how much energy it can provide the circuit; voltage can also represent how much energy is lost/used across resistors/devices (“voltage drop”).
- The unit for voltage is Volts (V) (which is equivalent to Joule/Coulomb or energy per charge). It is a scalar quantity.
- Kirchhoff’s 2nd Rule, also known as the Loop Rule, states that the sum of charges in electric potential (voltage) around the circuit (closed path) will be equal to zero.
- In other words, all the voltage stored in the battery will be used up by the devices (resistors) in the circuit; the magnitude of battery voltage is equal to the sum of all voltage drops across resistors in the circuit.
- Voltage in parallel configurations have a special rule: the voltage used in parallel settings are EQUAL (each parallel branch will have the same amount of voltage drop).
- We will use the stair case analogy for voltage (going down stairs in a building).
- Starting with the battery voltage (at the positive terminal) as the top floor, and going down a number of floors at each resistor (voltage drop), until you get to floor zero (end at the negative terminal)
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