Ohms Law Study Guide4/21/2021
When the resistors are connected in series to a 12.0-V battery, the current from the battery is 1.13 A. When t.
Ohms Law Study Guide How To Use OhmsYoull also find out how to use Ohms Law to solve circuit problems.![]() Ohms Law Study Guide Series To ALets make sure we understand the meaning of the terms we just used. Current is the flow of electricity, or flow of electrons, around an electrical circuit as measured in amps. Resistance is the tendency of a component or material to hold back the flow of current, which is measured in ohms. And voltage is the difference in potential between two parts of a circuit as measured in volts. If you think of a circuit as like water flowing around a water slide, the current is the rate of water flow, and the voltage is how high the slope of the water slide is. How to Use Ohms Law As an equation, Ohms law can be written as I VR. Doing this allows you to calculate the three quantities about a particular circuit. If you know current and resistance, for example, you can figure out the voltage. You can use Ohms law for an individual component inside a circuit: the current through a bulb, voltage across the bulb, and resistance of the bulb. Or you can use Ohms law for the whole circuit, using the total current, voltage of the battery (total voltage), and total resistance. You can even do it for an individual branch in a series circuit. Not all electrical components follow Ohms law - not all are ohmic - but most are. Example Lets say you have a parallel circuit containing a 12-volt battery and two bulbs in separate branches: one with a resistance of 4 ohms, and the other with a resistance of 3 ohms. How do you think wed go about calculating the current going through the 3-ohm resistor To solve the problem, well need to use Ohms law for the 3-ohm resistor. Remember, current equals voltage divided by resistance, or I VR. This means the 3-ohm resistor also has a voltage of 12 volts running across it. So we know that V 12 volts, and that R 3 ohms. To calculate current, we divide 12 by 3, and get 4 amps, which is our answer. Current is the flow of electricity around an electrical circuit, which we measure in amps. Resistance, which we measure in ohms, is the tendency of a component to hold back the flow of current. Voltage refers to the difference in potential between two parts of a circuit, which we measure in volts. Ohms law is expressed as I VR, an equation that allows you to determine the three quantities of a designated circuit. Ohms law can be used for one component in a circuit, for a parallel branch, or for the whole circuit. In the case of the latter, you use the voltage of the battery, total current and total resistance. This approach only works for ohmic resistors, which includes most electronic devices. When the resistors are connected in series to a 12.0-V battery, the current from the battery is 1.13 A.
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