Search

6.2: Electromotive Force
https://phys.libretexts.org/Courses/Muhlenberg_College/Physics_122%3A_General_Physics_II_(Collett)/06%3A_Direct-Current_Circuits/6.02%3A_Electromotive_Force
All voltage sources have two fundamental parts: a source of electrical energy that has a electromotive force (emf) and an internal resistance r. The emf is the work done per charge to keep the potenti...All voltage sources have two fundamental parts: a source of electrical energy that has a electromotive force (emf) and an internal resistance r. The emf is the work done per charge to keep the potential difference of a source constant. The emf is equal to the potential difference across the terminals when no current is flowing. The internal resistance r of a voltage source affects the output voltage when a current flows. The voltage output of a device is called its terminal voltage.
4.2: Electric Potential Energy and Electrical Potential Difference
https://phys.libretexts.org/Courses/Georgia_State_University/GSU-TM-Introductory_Physics_II_(1112)/04%3A_Electric_Potential_Energy_Electrical_Potential_or_Voltage_and_Capacitance/4.02%3A_Electric_Potential_Energy_and_Electrical_Potential_Difference
A convenient choice of reference that relies on our common sense is that when the two charges are infinitely far apart, there is no interaction between them. (Recall the discussion of reference potent...A convenient choice of reference that relies on our common sense is that when the two charges are infinitely far apart, there is no interaction between them. (Recall the discussion of reference potential energy in Potential Energy and Conservation of Energy.) Taking the potential energy of this state to be zero removes the term $U_{ref}$ from the equation (just like when we say the ground is zero potential energy in a gravitational potential energy problem), and the potential energy of Q when…
20.2: Resistors in Series and Parallel
https://phys.libretexts.org/Bookshelves/University_Physics/Physics_(Boundless)/20%3A_Circuits_and_Direct_Currents/20.2%3A_Resistors_in_Series_and_Parallel
The total resistance in the circuit with resistors connected in series is equal to the sum of the individual resistances.
6.1: Electromotive Force
https://phys.libretexts.org/Courses/Georgia_State_University/GSU-TM-Physics_II_(2212)/06%3A_Resistive_Networks/6.01%3A_Electromotive_Force
Entering the given values for the emf, load resistance, and internal resistance into the expression above yields $I = \frac{\epsilon}{R + r} = \frac{12.00 \, V}{10.10 \, \Omega} = 1.188 \, A.$ Enter...Entering the given values for the emf, load resistance, and internal resistance into the expression above yields $I = \frac{\epsilon}{R + r} = \frac{12.00 \, V}{10.10 \, \Omega} = 1.188 \, A.$ Enter the known values into the equation $V_{terminal} = \epsilon - Ir$ to get the terminal voltage: $V_{terminal} = \epsilon - Ir = 12.00 \, V - (1.188 \, A)(0.100 \, \Omega) = 11.90 \, V.$ The terminal voltage here is only slightly lower than the emf, implying that the current drawn by this light l…
21.2: Electromotive Force - Terminal Voltage
https://phys.libretexts.org/Bookshelves/College_Physics/College_Physics_1e_(OpenStax)/21%3A_Circuits_Bioelectricity_and_DC_Instruments/21.02%3A_Electromotive_Force_-_Terminal_Voltage
If you connect an excessive number of 12-V lights in parallel to a car battery, they will be dim even when the battery is fresh and even if the wires to the lights have very low resistance. This impli...If you connect an excessive number of 12-V lights in parallel to a car battery, they will be dim even when the battery is fresh and even if the wires to the lights have very low resistance. This implies that the battery’s output voltage is reduced by the overload. The reason for the decrease in output voltage for depleted or overloaded batteries is that all voltage sources have two fundamental parts—a source of electrical energy and an internal resistance. This section examines both.
5.2: Electromotive Force
https://phys.libretexts.org/Courses/Bowdoin_College/Phys1140%3A_Introductory_Physics_II%3A_Part_1/05%3A_Direct_Current_Circuits/5.02%3A_Electromotive_Force
All voltage sources have two fundamental parts: a source of electrical energy that has a electromotive force (emf) and an internal resistance r. The emf is the work done per charge to keep the potenti...All voltage sources have two fundamental parts: a source of electrical energy that has a electromotive force (emf) and an internal resistance r. The emf is the work done per charge to keep the potential difference of a source constant. The emf is equal to the potential difference across the terminals when no current is flowing. The internal resistance r of a voltage source affects the output voltage when a current flows. The voltage output of a device is called its terminal voltage.
6.1: Electromotive Force
https://phys.libretexts.org/Courses/Georgia_State_University/GSU-TM-Introductory_Physics_II_(1112)/06%3A_Resistive_Networks/6.01%3A_Electromotive_Force
Entering the given values for the emf, load resistance, and internal resistance into the expression above yields $I = \frac{\epsilon}{R + r} = \frac{12.00 \, V}{10.10 \, \Omega} = 1.188 \, A.$ Enter...Entering the given values for the emf, load resistance, and internal resistance into the expression above yields $I = \frac{\epsilon}{R + r} = \frac{12.00 \, V}{10.10 \, \Omega} = 1.188 \, A.$ Enter the known values into the equation $V_{terminal} = \epsilon - Ir$ to get the terminal voltage: $V_{terminal} = \epsilon - Ir = 12.00 \, V - (1.188 \, A)(0.100 \, \Omega) = 11.90 \, V.$ The terminal voltage here is only slightly lower than the emf, implying that the current drawn by this light l…
6.2: Source Voltage
https://phys.libretexts.org/Courses/Kettering_University/Electricity_and_Magnetism_with_Applications_to_Amateur_Radio_and_Wireless_Technology/06%3A_Direct-Current_(DC)_Resistor_Circuits/6.02%3A_Source_Voltage
All voltage sources have two fundamental parts: a source of electrical energy that has a source voltage and an internal resistance. The source voltage is the work done per charge to keep the potential...All voltage sources have two fundamental parts: a source of electrical energy that has a source voltage and an internal resistance. The source voltage is the work done per charge to keep the potential difference of a source constant. The source voltage is equal to the potential difference across the terminals when no current is flowing. The internal resistance of a voltage source affects the output voltage when a current flows. The voltage output of a device is called its terminal voltage.
11.2: Electromotive Force
https://phys.libretexts.org/Courses/Joliet_Junior_College/PHYS202_-_JJC_-_Testing/11%3A_Chapter_11/11.02%3A_Electromotive_Force
All voltage sources have two fundamental parts: a source of electrical energy that has a electromotive force (emf) and an internal resistance r. The emf is the work done per charge to keep the potenti...All voltage sources have two fundamental parts: a source of electrical energy that has a electromotive force (emf) and an internal resistance r. The emf is the work done per charge to keep the potential difference of a source constant. The emf is equal to the potential difference across the terminals when no current is flowing. The internal resistance r of a voltage source affects the output voltage when a current flows. The voltage output of a device is called its terminal voltage.
18.1: Overview
https://phys.libretexts.org/Bookshelves/University_Physics/Physics_(Boundless)/18%3A_Electric_Potential_and_Electric_Field/18.1%3A_Overview
Electric potential and field are related in that potential is a property of the field that describes the field’s action.
10.2: Electromotive Force
https://phys.libretexts.org/Bookshelves/University_Physics/University_Physics_(OpenStax)/University_Physics_II_-_Thermodynamics_Electricity_and_Magnetism_(OpenStax)/10%3A_Direct-Current_Circuits/10.02%3A_Electromotive_Force
All voltage sources have two fundamental parts: a source of electrical energy that has a electromotive force (emf) and an internal resistance r. The emf is the work done per charge to keep the potenti...All voltage sources have two fundamental parts: a source of electrical energy that has a electromotive force (emf) and an internal resistance r. The emf is the work done per charge to keep the potential difference of a source constant. The emf is equal to the potential difference across the terminals when no current is flowing. The internal resistance r of a voltage source affects the output voltage when a current flows. The voltage output of a device is called its terminal voltage.

Search

Text Color

Text Size

Margin Size

Font Type

Support Center

How can we help?