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Questions and Answers
What is the current supplied by a nine volt battery to a cordless iron with a resistance of 18 Ω?
What is the current supplied by a nine volt battery to a cordless iron with a resistance of 18 Ω?
If a cd player has a resistance of 40 Ω and a current of 0.1 A flowing through it, what is the voltage across it?
If a cd player has a resistance of 40 Ω and a current of 0.1 A flowing through it, what is the voltage across it?
Which of the following statements about conventional current and electron flow is correct?
Which of the following statements about conventional current and electron flow is correct?
In a circuit with a 9V battery and a load of 18 Ω, what is the power consumed by the load?
In a circuit with a 9V battery and a load of 18 Ω, what is the power consumed by the load?
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What is the total resistance in a circuit if three resistors of 2 Ω, 3 Ω, and 5 Ω are connected in series?
What is the total resistance in a circuit if three resistors of 2 Ω, 3 Ω, and 5 Ω are connected in series?
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Study Notes
Disclaimer
- This presentation is for informational purposes only
- Examples, images, and references are for educational use only
- Credits for images are given to the original open source
- Images are not for promotional use
Conventional Current vs. Electron Flow
- Conventional Current: Charges flow from the positive terminal to the negative terminal
- Electron Flow: Charges flow from the negative terminal to the positive terminal
Electric Current (I)
- Electric current (I) is the flow of charges
- It is pushed by the voltage (V)
- It is opposed by the resistance (R)
Ohm's Law
- V = IR
- I = V/R
- R = V/I
Example Problem 1
- A nine-volt battery powers a cordless iron with a resistance of 18Ω
- The current is 0.5A (calculated using Ohm's Law)
Example Problem 2
- A CD player with a resistance of 40Ω has a current of 0.1A
- The voltage is 4V (calculated using Ohm's Law)
DC vs. AC
-
DC (Direct Current):
- One pathway
- Constant voltage
-
AC (Alternating Current):
- Periodic moving back and forth
- Changing voltage
Electric Circuit
- A closed loop of interconnected components
- Allows electric current to flow
Resistors in Series and Parallel Circuits
- Series Circuit: Resistors are connected end-to-end
- Parallel Circuit: Resistors are connected across each other
Series Circuit Example
- R1 = 15Ω, R2 = 2Ω, R3 = 3Ω
- Total resistance (Req) in series is calculated by adding the individual resistances
Series Circuit Example calculation:
- Req = R1 + R2 + R3 = 15Ω + 2Ω + 3Ω = 20Ω
- With a total voltage of 12V the resulting current (IT) using Ohm's law: IT = VT/Req = 12V/20Ω = 0.6A
Parallel Circuit Example
- R1 = 1Ω, R2 = 2Ω, R3 = 3Ω
- Total resistance (Req) in parallel is calculated using the reciprocal formula: 1/Req=1/ R1 + 1/R2 + 1/ R3
Parallel Circuit Example calculation:
- 1/Req = 1/1Ω + 1/2Ω + 1/3Ω = 11/6Ω
- Req = 6/11Ω
- With a total voltage of 12V the resulting current (IT) using Ohm's law: It = VT/Req = 12V/(6/11Ω) = 22A
Electric Power (P)
- P = V x I
- Units are Watts (W)
- where V = volts, I = current
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Description
Test your knowledge on electric current concepts including conventional current versus electron flow, Ohm's Law, and the differences between DC and AC. This quiz covers definitions, calculations, and example problems to solidify your understanding of electrical circuits.
