Solutions 20.37-20.51 - UF Physics
... 37. The first step is to observe that there are no resistors in parallel but that the 2- and 5-ohm resistors are in series. This effective 7-ohm resistor is in parallel with the 6-ohm resistor. Thus, the circuit has been reduced partially to the circuit shown, where R1 is found from 1/R1 = 1/7 + 1/6 ...
... 37. The first step is to observe that there are no resistors in parallel but that the 2- and 5-ohm resistors are in series. This effective 7-ohm resistor is in parallel with the 6-ohm resistor. Thus, the circuit has been reduced partially to the circuit shown, where R1 is found from 1/R1 = 1/7 + 1/6 ...
Modeling emf, Potential Difference, and Internal Resistance
... Browse to http://phet.colorado.edu/simulations/cck/cck.jnlp. Create a complete circuit using the provided elements such that the circuit satisfies these two conditions: 1. The battery’s emf () is 9.5V. 2. V of the battery is 9.0V when the switch is closed due to internal resistance. •Make sure the ...
... Browse to http://phet.colorado.edu/simulations/cck/cck.jnlp. Create a complete circuit using the provided elements such that the circuit satisfies these two conditions: 1. The battery’s emf () is 9.5V. 2. V of the battery is 9.0V when the switch is closed due to internal resistance. •Make sure the ...
Action of the Commutator
... external circuit is connected to brushes which press on these slip rings, the electrical polarity of each ring will alternate as the coil rotates, so that the current set up will also be alternating. In order that the current may be unidirectional, it is necessary for one brush always to be positive ...
... external circuit is connected to brushes which press on these slip rings, the electrical polarity of each ring will alternate as the coil rotates, so that the current set up will also be alternating. In order that the current may be unidirectional, it is necessary for one brush always to be positive ...
Electric Current is charge in motion Electric Current
... electric current that caused a separation of the leaves of an electroscope. Example: Carbon electrode and zinc electrode in sulfuric acid. Zinc ions enter the acid; electrons flow from zinc electrode (-) to carbon electrode (+). Thus, a potential difference is established between the two electrodes. ...
... electric current that caused a separation of the leaves of an electroscope. Example: Carbon electrode and zinc electrode in sulfuric acid. Zinc ions enter the acid; electrons flow from zinc electrode (-) to carbon electrode (+). Thus, a potential difference is established between the two electrodes. ...
Resistors Connected in Series and in Parallel
... The figure at the right shows resistors R1 and R2 connected in parallel. A set of resistors is connected in parallel if and only if the voltage across each resistor is the same. If a battery with voltage V is placed across resistors connected in parallel, the battery “sees” a single equivalent resis ...
... The figure at the right shows resistors R1 and R2 connected in parallel. A set of resistors is connected in parallel if and only if the voltage across each resistor is the same. If a battery with voltage V is placed across resistors connected in parallel, the battery “sees” a single equivalent resis ...
Resistors Connected in Series and in Parallel
... The figure at the right shows resistors R1 and R2 connected in parallel. A set of resistors is connected in parallel if and only if the voltage across each resistor is the same. If a battery with voltage V is placed across resistors connected in parallel, the battery “sees” a single equivalent resis ...
... The figure at the right shows resistors R1 and R2 connected in parallel. A set of resistors is connected in parallel if and only if the voltage across each resistor is the same. If a battery with voltage V is placed across resistors connected in parallel, the battery “sees” a single equivalent resis ...
Parallel Circuits
... provides another independent path for current to flow. As a result, more current flows for the same resistance. Because of this, when using Ohm’s law to calculate, you will see that resistance is less. ...
... provides another independent path for current to flow. As a result, more current flows for the same resistance. Because of this, when using Ohm’s law to calculate, you will see that resistance is less. ...
A LED Exercise
... 1. Initially the power supply is set at Vs = 6V. What value is required for the resistor so that the LED operates at 60 mA? ...
... 1. Initially the power supply is set at Vs = 6V. What value is required for the resistor so that the LED operates at 60 mA? ...
Multimeter
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A multimeter or a multitester, also known as a VOM (Volt-Ohm meter or Volt-Ohm-milliammeter ), is an electronic measuring instrument that combines several measurement functions in one unit. A typical multimeter would include basic features such as the ability to measure voltage, current, and resistance. Analog multimeters use a microammeter whose pointer moves over a scale calibrated for all the different measurements that can be made. Digital multimeters (DMM, DVOM) display the measured value in numerals, and may also display a bar of a length proportional to the quantity being measured. Digital multimeters are now far more common but analog multimeters are still preferable in some cases, for example when monitoring a rapidly varying value. A multimeter can be a hand-held device useful for basic fault finding and field service work, or a bench instrument which can measure to a very high degree of accuracy. They can be used to troubleshoot electrical problems in a wide array of industrial and household devices such as electronic equipment, motor controls, domestic appliances, power supplies, and wiring systems.Multimeters are available in a wide range of features and prices. Cheap multimeters can cost less than US$10, while laboratory-grade models with certified calibration can cost more than US$5,000.