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Measuring moving charges

Measuring moving charges. Voltmeter. Measures potential difference (voltage), the energy of each charge Connects to either side of a load. Ammeter. Measures current, how many charges move past a point in a given time. Connected into a circuit between two parts. Ohm’s Law.

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Measuring moving charges

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  1. Measuring moving charges

  2. Voltmeter • Measures potential difference (voltage), the energy of each charge • Connects to either side of a load

  3. Ammeter • Measures current, how many charges move past a point in a given time. • Connected into a circuit between two parts

  4. Ohm’s Law • George Ohm discovered a relationship between voltage and current. • If you increase the voltage to a load, current will increase • If you keep same voltage but increase the load, current will decrease

  5. Ohm’s Law • The equation for this relationship is: V = IR Where: V - voltage (measured in volts, V) I - current (measured in amps, A) R - resistance (measured in ohms, Ω)

  6. Solving Science Problems Involving Equations • Given : record all given quantities • Unknown : identify what value you are looking for. • Equation : write the equation you are going to use. • Solution : Substitute values into the equation and calculate the answer (include the correct units). • Statement : write an answer statement in sentence form.

  7. Example: • The current required to operate an electric can opener is 1.5A. What is the resistance of the can opener if the voltage supplied is 120V? Given:Equation:Solution : Unknown: Statement : 120 V = R 1.5 A V=120V V=IR I=1.5A V=IR I I 80Ω= R R=? V=R I Therefore the resistance of the can opener is 80 Ω.

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