Electric Circuits: Voltage, Current, Resistance, and Power Calculations

Vocabulary flashcards covering voltage, current, resistance, circuit units, properties, and Ohms Law calculation examples based on the lecture notes.

Cause of Electron Flow

Voltage

Current

The flow of electrons in an electric circuit.

Amperes

The unit used to measure electrical current.

Current Types Opposed by Resistance

Direct current, Alternating current, and RF current.

Alternating Current

Current that alternates between positive and negative directions.

Frequency

The number of times per second that an alternating current makes a complete cycle.

Hertz (Hz)

The unit of frequency, which is equivalent to cycles per second.

Reason Metals are Good Conductors

They have many free electrons.

Glass

A good electrical insulator.

Voltage Formula

$$E = I \times R$$

Resistance Formula

$$R = \frac{E}{I}$$

Current Formula

$$I = \frac{E}{R}$$

Voltage across a $2\,\text{ohm}$ resistor with $0.5\,\text{amperes}$ current

$$1\,\text{volt}$$

Voltage across a $10\,\text{ohm}$ resistor with $1\,\text{ampere}$ current

$$10\,\text{volts}$$

Voltage across a $10\,\text{ohm}$ resistor with $2\,\text{amperes}$ current

$$20\,\text{volts}$$

Resistance of a circuit with $3\,\text{amperes}$ current at $90\,\text{volts}$

$$30\,\text{ohms}$$

Resistance of a circuit with $12\,\text{volts}$ applied and $1.5\,\text{amperes}$ current

$$8\,\text{ohms}$$

Resistance of a circuit drawing $4\,\text{amperes}$ from a $12\,\text{volt}$ source

$$3\,\text{ohms}$$

Current in a circuit with $120\,\text{volts}$ applied and $80\,\text{ohms}$ resistance

$$1.5\,\text{amperes}$$

Current through a $100\,\text{ohm}$ resistor connected across $200\,\text{volts}$

$$2\,\text{amperes}$$

Current through a $24\,\text{ohm}$ resistor connected across $240\,\text{volts}$

$$10\,\text{amperes}$$