DC Circuits and Schematics

What is power defined as?

Rate of energy consumption or conversion

What is the formula for power?

P = E / t

In the formula for power what is the P?

Power measured in watts (W)

In the formula for power what is the E?

Energy in joules (J)

In the formula for power what is t?

Time measured in seconds (s)

How much is 1 watt equal in joules per second?

1 watt = 1 joule/second

If 300 joules of energy is consumed in 10 seconds. What would be the power in watts?

30 W

What is watt named after?

James Watt

In James Watt experiment, what was one horsepower required to move?

33,000 pounds 1 foot in 1 minute

What does 1 horsepower equal to watts?

764 W

How is voltage expressed in terms of energy and charge?

E = E/Q

In this formula to find potential difference in volts, what is E?

Potential difference in volts (V)

In this formula to find potential difference in volts, what is E?

Energy expanded or absorbed in joules (J)

In this formula to find potential difference in volts, what is Q?

Charge measured in coulombs (C)

What is the formula to find current?

I = Q/T

In the formula to find current what is I?

Current in amperes (A)

In the formula to find current what is Q?

Charge in coulombs (C)

In the formula to find current what is T?

Time

Why is current expressed as Q/t?

Emphasizes that current is the rate at which charge flows through a conductor

What is the general power formula?

P = I(E)

In the general power formula what is P?

Power

In the general power formula what is I?

Current

In the general power formula what is E?

Volts

What is the general power formula for?

Multiplying voltage (W/Q) times current (Q/t)

If a circuit has a known voltage of 24 volts and a current of 2 amps. What is the power?

48 W

What is this formula to find power if current and resistance is known?

P = I²R

What is P?

Power

What is I?

Current

What is R?

Resistance

If a circuit has a known current of 2 amps and a resistance of 100 ohms, what is the power?

400 W

What is the formula to find power if voltage and resistance is known?

P = E²/R

What is P?

Power

What is E?

Volts

What is R?

Resistance

If a circuit has a known voltage of 24 volts and a resistance of 20 ohms. What is the power?

28.8 W

What is the formula to find the total power dissipated?

P_T = P₁ + P₂ +…

What is this?

Power wheel

What does the power wheel provide?

Formula to find power, resistance, current, and voltage

What is a series DC circuit?

Basic electrical circuit, current flows through all components

How do you find total resistance in a series circuit?

Adding every individual resistor up

What is the formal to find the total resistance in a series circuit?

R_T = R₁ + R₂ + R₃ + …

What is the formula to find current in a series circuit?

I = E/R_T

What is changing resistance?

Doubling resistance halves power, halving resistance doubles power

What is voltage drop?

The loss in electrical pressure or emf caused by forcing electrons through a resistor

If current is known, how do you find the voltage source?

By adding the resistors