Physics: Ohm's Law Flashcards
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Questions and Answers

What is Ohm's Law formula wheel?

What does P stand for?

Power

What is the unit of measure for power?

Watts (W)

What does I stand for?

<p>Current</p> Signup and view all the answers

What is the unit of measure for current?

<p>Amps (A)</p> Signup and view all the answers

What does V stand for?

<p>Electro-motive force</p> Signup and view all the answers

What is the unit of measure for electro-motive force?

<p>Volts (V)</p> Signup and view all the answers

What does R stand for?

<p>Resistance</p> Signup and view all the answers

What is the unit of measure for resistance?

<p>Ohms (Ω)</p> Signup and view all the answers

What does the square root symbol (√) signify?

<p>Square root</p> Signup and view all the answers

What does the symbol ² represent?

<p>Squared</p> Signup and view all the answers

V x I = P translate to units of measure

<p>volts x amps = watts</p> Signup and view all the answers

R x I² = P translate to units of measure

<p>ohms x amps² = watts</p> Signup and view all the answers

V² / R = P translate to units of measure

<p>volts² / ohms = watts</p> Signup and view all the answers

R x I = V translate to units of measure

<p>ohms x amps = volts</p> Signup and view all the answers

P / I = V translate to units of measure

<p>watts / amps = volts</p> Signup and view all the answers

√(P x R) = V translate to units of measure

<p>√(watts x ohms) = volts</p> Signup and view all the answers

V / I = R translate to units of measure

<p>volts / amps = ohms</p> Signup and view all the answers

V² / P = R translate to units of measure

<p>volts² / watts = ohms</p> Signup and view all the answers

P / I² = R translate to units of measure

<p>watts / amps² = ohms</p> Signup and view all the answers

V / R = I translate to units of measure

<p>volts / ohms = amps</p> Signup and view all the answers

P / V = I translate to units of measure

<p>watts / volts = amps</p> Signup and view all the answers

√(P / R) = I translate to units of measure

<p>√(watts / ohms) = amps</p> Signup and view all the answers

If we connect a 12-volt battery to a lamp, measure the current, and find that it draws 1 amp, how much power is being consumed?

<p>12 watts</p> Signup and view all the answers

If we have a circuit with a 12-volt battery, a lamp, and a resistor connected in series, how much current would flow if the total resistance in the circuit is 150 ohms?

<p>0.08 amps</p> Signup and view all the answers

What is the resistance of a cable that allows 10 amps to flow through it when it is connected to a 24-volt battery?

<p>2.4 ohms</p> Signup and view all the answers

A 2 amp fuse and a 100 ohm resistor are wired in series. What is the minimum voltage required to blow the fuse?

<p>200 volts</p> Signup and view all the answers

A lamp is rated at 500 watts at 12 volts. What is the effective resistance of the filament at its operating temperature?

<p>2.88 ohms</p> Signup and view all the answers

Shop electric needs to run DC power to a 16 amp LED panel 50' away. How much power is converted to heat if the current is 16 amps?

<p>256 watts</p> Signup and view all the answers

In a 24 volt circuit, a lamp draws 6.25 amps. What is the effective resistance of the lamp?

<p>3.8 ohms</p> Signup and view all the answers

If a current of 1 amp is flowing through a 150-ohm resistor in a DC circuit, what is the voltage drop across the resistor?

<p>150 volts</p> Signup and view all the answers

A 12-volt circuit has a 3 amp fuse. How much resistance is needed in the circuit to keep the fuse from blowing?

<p>4 ohms</p> Signup and view all the answers

How many ohms are there in a megaohm?

<p>1,000,000</p> Signup and view all the answers

How many ohms are there in a milliohm?

<p>0.001</p> Signup and view all the answers

The prefix milli means what?

<p>one thousandth</p> Signup and view all the answers

The prefix mega means what?

<p>one million</p> Signup and view all the answers

The prefix kilo means what?

<p>one thousand</p> Signup and view all the answers

How many watts are in a kilowatt?

<p>1,000 watts</p> Signup and view all the answers

How many watts are in a milliwatt?

<p>0.001 watts</p> Signup and view all the answers

How many volts are in a kilovolt?

<p>1,000 volts</p> Signup and view all the answers

How many volts are in a millivolt?

<p>0.001 volts</p> Signup and view all the answers

What is Power Formula wheel?

Signup and view all the answers

What is Ohm's Law wheel?

Signup and view all the answers

Study Notes

Ohm's Law Formula Wheel

  • Ohm's Law establishes the relationship between voltage (V), current (I), resistance (R), and power (P) in electrical circuits.
  • The formulas derived from Ohm's Law can be manipulated to find any one of the four variables when the other three are known.

Power and Current

  • Power (P) is measured in watts (W) and indicates how much energy is consumed or produced.
  • Current (I) is the flow of electric charge, measured in amps (A).

Voltage and Resistance

  • Electro-motive force (voltage) is the potential difference that drives current through a circuit, measured in volts (V).
  • Resistance (R) opposes the flow of current, measured in ohms (Ω).

Key Formulas

  • P = V x I translates to watts = volts x amps.
  • R = V / I translates to ohms = volts / amps.
  • P = I² x R translates to watts = amps² x ohms.
  • V = I x R translates to volts = amps x ohms.
  • V = P / I translates to volts = watts / amps.

Square Root Formulas

  • V = √(P x R) translates to volts = square root of (watts x ohms).
  • I = √(P / R) translates to amps = square root of (watts / ohms).

Practical Examples

  • A 12-volt battery supplying a lamp that draws 1 amp consumes 12 watts of power.
  • In a series circuit with a 12-volt battery and a total resistance of 150 ohms, the current is 0.08 amps.
  • If a 24-volt battery provides power to a device with a resistance of 2.4 ohms, it allows for 10 amps of current.

Resistance and Fuse Ratings

  • A circuit with a 2 amp fuse and a 100 ohm resistor requires a minimum voltage of 200 volts to blow the fuse.
  • A lamp rated at 500 watts at 12 volts has an effective resistance of 0.288 ohms.

Heat in Conductors

  • A 16 amp current through a 20 gauge wire with 10 ohms of resistance over distances yields 256 watts converted to heat.

Conversion Factors

  • 1 megaohm = 1,000,000 ohms.
  • 1 milliohm = 0.01 ohms.
  • The prefix "milli" signifies one thousandth (0.001).
  • The prefix "mega" signifies one million (1,000,000).
  • The prefix "kilo" signifies one thousand (1,000).
  • There are 1,000 watts in a kilowatt and 0.001 watts in a milliwatt.
  • A kilovolt is equal to 1,000 volts, while a millivolt is equal to 0.001 volts.

Conclusion

  • Familiarity with these concepts allows for effective analysis and troubleshooting of electrical systems. Understanding Ohm's Law is essential for anyone working in electrical engineering or related fields.

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Test your knowledge of Ohm's Law with these flashcards. Each card challenges you on key concepts such as power, current, and electro-motive force. Perfect for reinforcing fundamental physics principles.

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