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Transcript
V = IR Notes Voltage- ( ) Units: ____ _________________________________________________________________________________ Current – ( ) Units: ______ _________________________________________________________________________________ Resistance – ( ) Units: ______ _________________________________________________________________________________ _________________________________________________________________________________ • The current that flows in a circuit depends on the ______________ applied across the circuit. • How much current flows will also depend on the ______________ ________________ of the circuit. ELECTRICAL RESISTANCE DEPENDS ON: 1. __________________ of the metal the better the conductor, the more freely the electrons can move 2. _________________ of the wire the thicker the wire, the more electrons that can pass through a given area in a certain amount of time 3. ________________ of the wire the longer the wire, the farther the “signal” has to travel 4. _________________ of the metal the quicker the atoms of the metal vibrate, the harder for the electrons to move around them Ohm’s Law Notes The amount of current in a circuit is _____________________ proportional to the voltage impressed across the circuit. The amount of current in a circuit is _____________________ proportional to the resistance of the circuit. This relationship between voltage, current, and resistance is called ______________ Law. OHM’S LAW EQUATION: I = ____________ V = ____________ R = ____________ UNITS: This means: a potential difference of 1 V impressed across a circuit of resistance 1 will produce a current of _____ A. Common Resistances and Electric Shock: Typical lamp cord has a ________ resistance while a light bulb has a ________ resistance. The human body has a resistance that can vary from __________ if you are soaked with salt water to ______________ if your skin is very dry. Therefore, water __________________ your resistance and when combined with a potential difference across your body, it can cause a harmful amount of current to flow through you. Electric shock in the body is caused by ___________________(not voltage). Examples: 1. A 30-V battery is connected to a 10 resistor. What is the current in the circuit? 2. A motor with an operating resistance of 32 is connected to a voltage source. The current in the circuit is 3.8 A. What is the voltage of the source?