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Questions and Answers
What is the direction of electric current flow?
What is the direction of electric current flow?
- From positive to negative terminals (correct)
- From negative to positive terminals
- From the anode to the cathode
- From the resistor to the capacitor
What is the unit of measurement for electric current?
What is the unit of measurement for electric current?
- Volts (V)
- Ohms (Ω)
- Amperes (A) (correct)
- Watts (W)
What is the physical property that opposes electric current flow?
What is the physical property that opposes electric current flow?
- Voltage
- Inductance
- Current
- Resistance (correct)
What is the formula that relates voltage, current, and resistance?
What is the formula that relates voltage, current, and resistance?
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What type of material allows electric current to flow?
What type of material allows electric current to flow?
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In a series circuit, what is the characteristic of the current?
In a series circuit, what is the characteristic of the current?
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Study Notes
Electrical Basics
Electric Charge
- Electric charge is a fundamental property of matter
- There are two types of electric charge: positive and negative
- Like charges repel each other, while opposite charges attract each other
Electric Current
- Electric current is the flow of electric charge (e.g. electrons)
- Measured in amperes (A)
- Current flow is from positive to negative terminals
Voltage (Electric Potential Difference)
- Voltage is the potential difference between two points in a circuit
- Measured in volts (V)
- Can be thought of as the "pressure" that drives electric current
Resistance
- Resistance is the opposition to electric current flow
- Measured in ohms (Ω)
- Depends on the material, length, and cross-sectional area of a conductor
Ohm's Law
- Relates voltage, current, and resistance: V = I × R
- Can be rearranged to solve for any of the three variables
Conductors and Insulators
- Conductors: materials that allow electric current to flow (e.g. copper, aluminum)
- Insulators: materials that resist electric current flow (e.g. rubber, glass)
Series and Parallel Circuits
- Series circuit: components connected one after the other
- Current is the same throughout the circuit
- Voltage is divided among components
- Parallel circuit: components connected between the same two points
- Voltage is the same across each component
- Current is divided among components
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