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Electric Current

Electric Current. ELECTRIC CURRENT. Electric charges that flow from one point to another. It is measured as the rate at which charges pass a point. ELECTRIC CURRENT. I = q / t q = charge (C) t = time (s) I = current = amperes (A) 1 A = 1 C/s. ELECTRIC CURRENT.

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Electric Current

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  1. Electric Current

  2. ELECTRIC CURRENT • Electric charges that flow from one point to another. • It is measured as the rate at which charges pass a point.

  3. ELECTRIC CURRENT I = q / t • q = charge (C) • t = time (s) • I = current = amperes (A) • 1 A = 1 C/s

  4. ELECTRIC CURRENT In order to have a current between 2 points, you must have: • A conducting path between the two points (Ex: wire) • A potential difference between the points (voltage). • Current is measured using an ammeter.

  5. ELECTRIC CURRENT • Conventional Current: The direction of current is from positive (high potential) to negative (low potential). • The electrons in a conductor move under the influence of the electric field inside the conductor. • The electrons move in the opposite direction of the electric field.

  6. ELECTRIC POWER • The rate at which electric energy is converted into other forms of energy. P = I V P = Power (watts) I = Current (amperes V = Potential (volts)

  7. Given: V = 6.0 V I = 0.50 A Find: P = ? P = IV = (0.50 A)(6.0 V) = 3.0 W Ex: A 6.0 V battery delivers 0.50 A of current to an electric motor connected across its terminals. What power is delivered to the motor?

  8. Given: P = 3.0 W t = 5.0 min = 3.0 x 102 s Find: Energy = ? P = Energy / t Pt = Energy =(3.0 W)(3.0 x 102 s) Energy = 9.0 x 102 J Ex: If the motor runs for 5 minutes, how much electric energy is delivered?

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