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# Measuring moving charges - PowerPoint PPT Presentation

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

• Measures potential difference (voltage), the energy of each charge

• Connects to either side of a load

• Measures current, how many charges move past a point in a given time.

• Connected into a circuit between two parts

• 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

• 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)

• 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.

• 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.