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Ohm’s Law & Electrical Power

Ohm’s Law & Electrical Power. Presented to Physical Science By K. Whitfield Fall 2009. Four Important Electrical Quantities. Voltage Current Resistance Power. Voltage. Pushes electrons Force-like AKA potential difference Unit: Volt Joule/coulomb Variable: V. Current.

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Ohm’s Law & Electrical Power

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  1. Ohm’s Law & Electrical Power Presented to Physical Science By K. Whitfield Fall 2009

  2. Four Important Electrical Quantities • Voltage • Current • Resistance • Power

  3. Voltage • Pushes electrons • Force-like • AKA potential difference • Unit: • Volt • Joule/coulomb • Variable: V

  4. Current • Rate of electron flow • How fast negative charges are moving • Unit • Ampere • AKA Amp • Coulomb/second • Variable: I

  5. Resistance • How much the substance resists the movement of electrons • The higher the resistance, the more difficult the electrons have getting through • Unit: Ohm • Variable: R or

  6. Resistance in Wire • Which type of wire has most resistance? • Long, hot, small diameter? • Short, cold, large diameter?

  7. Electrical Power • Rate of doing electrical work • Unit: • Watt • Joule/sec • Variable: P

  8. Ohm’s Law • Voltage varies directly with current. • The more voltage, the higher the current (if all other variables stay the same) • Resistance varies indirectly with current • The more resistance, the lower the current. • Dimmer switches

  9. Ohm’s Law Continued • Equation • I=V/R • V=RI • R=V/I

  10. Equation for Electrical Power • P=VI • Power=Voltage x Current • Can determine the amount of power in entire circuit or just the power used by one load • Unit • Watt=joule/sec • Volt x amp • Joul/coul x coul/sec

  11. Sample Problems

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