In physics, power is the amount of energy transferred or converted per unit time. In the International System of Units, the unit of power is the watt, equal to one joule per second. In older works, power is sometimes called activity.[1][2][3] Power is a scalar quantity.
Specifying power in particular systems may require attention to other quantities; for example, the power involved in moving a ground vehicle is the product of the aerodynamic drag plus traction force on the wheels, and the velocity of the vehicle. The output power of a motor is the product of the torque that the motor generates and the angular velocity of its output shaft. Likewise, the power dissipated in an electrical element of a circuit is the product of the current flowing through the element and of the voltage across the element.[4][5]
The dimension of power is energy divided by time. In the International System of Units (SI), the unit of power is the watt (W), which is equal to one joule per second. Other common and traditional measures are horsepower (hp), comparing to the power of a horse; one mechanical horsepower equals about 745.7 watts. Other units of power include ergs per second (erg/s), foot-pounds per minute, dBm, a logarithmic measure relative to a reference of 1 milliwatt, calories per hour, BTU per hour (BTU/h), and tons of refrigeration.
As a simple example, burning one kilogram of coal releases more energy than detonating a kilogram of TNT,[6] but because the TNT reaction releases energy more quickly, it delivers more power than the coal.If ΔW is the amount of work performed during a period of time of duration Δt, the average power Pavg over that period is given by the formula P a v g = Δ W Δ t . \displaystyle P_\mathrm avg =\frac \Delta W\Delta t. It is the average amount of work done or energy converted per unit of time. Average power is often called "power" when the context makes it clear.
Power in mechanical systems is the combination of forces and movement. In particular, power is the product of a force on an object and the object's velocity, or the product of a torque on a shaft and the shaft's angular velocity.
Power is an American crime drama thriller television series created and produced by Courtney A. Kemp in collaboration with Curtis "50 Cent" Jackson.[1] It aired on the Starz network from June 7, 2014, to February 9, 2020.
Upon release, Power gained positive reviews and is one of Starz's highest-rated shows and one of cable's most-watched shows.[2][3] Prior to the fifth-season premiere, Starz renewed the show for a sixth and final season, which premiered on August 25, 2019.[4][5]
Power tells the story of James St. Patrick, an intelligent, smooth yet ruthless drug dealer who goes by the alias of "Ghost." He wishes to leave the criminal world to pursue legitimate business interests as a nightclub owner. St. Patrick aims to balance those two lives, while also avoiding police capture, trying to navigate his crumbling marriage and manage shifting economic alliances.
The show features James' family, which consists of his wife Tasha, twins Tariq and Raina and baby Yasmine. Power also follows James' criminal partner and best friend Tommy Egan, love interest and criminal prosecutor Angela Valdes, friend-turned-rival Kanan Stark, protege and rival Andre Coleman, and Angela's colleague, Cooper Saxe. Defense attorney Joe Proctor, district attorney John Mak and politician Rashad Tate also appear in the show's later seasons.
In Australia, all episodes are available to stream after their US airing on Stan.[6] The show is available weekly after its US airing on Netflix in the United Kingdom and Ireland.[7][8][9] In Scandinavia and Finland, all episodes are available to stream on HBO Nordic.[10]
Season 1 of Power received mixed reviews from critics. Review aggregator Metacritic gives the season a score of 57 out of 100, based on 15 reviews, indicating a mixed reaction to the series.[25] Review aggregator Rotten Tomatoes gives the season a score of 44%, based on 18 reviews, with an average rating of 5.7/10. The site's consensus states, "Power suffers from excessive plotting and the use of overly familiar by-the-numbers story elements."[26]
Tim Goodman of The Hollywood Reporter observed in his review, "Power seemingly wants to be a show that tells a big, complicated, meaningful story about, well, the perils and problems of power and how one man deals with them."[27] Critic Brian Lowry of Variety states in his review, "The three previewed episodes of the show, created by The Good Wife alumna Courtney A. Kemp, move briskly enough, but they're still only moderately compelling. And while 50 Cent's participation provides some promotional heft (he has a cameo in a later episode), the allure of such behind-the-scenes marquee names is usually limited. Mostly, this is undemanding escapism with all the requisite pay-TV trappings, along the lines of what Cinemax is offering in episodic form. While that might be a formula to keep Ghost visible for some time to come, creatively speaking, it leaves Power a touch low on juice.[28]
With the conclusion of the original series, it was announced that Starz had planned four upcoming spin-offs in the same universe as Power. These begin with Power Book II: Ghost, which, following shortly after the events of the original series, focuses on Ghost's son Tariq navigating his new criminal life and intending to shed his father's legacy while dealing with mounting pressure to protect his family, including his mother Tasha. The series co-stars Mary J. Blige and Method Man.[35] The other spin-offs include: Power Book III: Raising Kanan, a prequel into the life of Kanan Stark (50 Cent); Power Book IV: Force, which follows Tommy Egan (Joseph Sikora) originally headed to Los Angeles, California and ending up in the city of Chicago; and Power Book V: Influence, a sequel set in the political world centering on Councilman Tate's (Larenz Tate) ruthless rise to power.[36][37] The development of Power Book V: Influence was cancelled in August 2022 and the series would not be moving forward.[38] In March 2024, a prequel series, Origins, which will follow the beginning story of characters Ghost and Tommy, was confirmed to be in development.[39]
Power Book III: Raising Kanan premiered on July 18, 2021,[37] and has aired two seasons. In August 2022, the series was renewed for a third season, which premiered on December 1, 2023. In November 2023, ahead of the third season, the series was renewed for a fourth season.[42]
The U.S.-Africa Clean Tech Energy Network (CTEN) connects U.S. and African cleantech energy companies to market opportunities where project-ready technology can increase access to reliable electricity.
USAID and Power Africa are building a public-private partnership to improve access to clean electricity and internet connectivity at health facilities in sub-Saharan Africa. Through renewable energy and digital solutions, this alliance can deliver reliable, climate-friendly, life-saving power to 10,000 remote health facilities.
PowerOutage.us is an ongoing project created to track, record, and aggregate power outages across the United States. Find out about us on our About page.
Click on a state to see more detailed info.
Data is updated site wide approximately every ten minutes.
e-POWER is Nissan's unique electric-drive powertrain that integrates a gasoline engine and motor.
Since the engine only generates electricity and the system is 100% driven by a high-output motor, it is possible to enjoy the driving experience of an EV.
e-POWER utilizes motor control technology cultivated in past EV development activities, powertrain integration technology, and energy management technology. By changing the combination of electric-drive motors and power-generation engines, it delivers quiet driving with excellent response over a wide range of vehicles from compact cars to minivans and SUVs.
Since e-POWER is 100% motor-driven, it provides a responsive and powerful driving experience, by taking advantage of the characteristic that the motor can generate maximum torque from when it starts.
The system can freely control engine start timing because the engine is not directly connected to the wheels. It provides very quiet driving with reduced engine operation time by driving the vehicle with just the motor from start to low/mid-range speed and starting the engine and generating electricity in fast speed areas with elevated road noise. It also achieves low fuel consumption because it generates electricity at efficient engine RPM.
The e-POWER system is comprised of a high-voltage battery and the powertrain, which is integrated with a high-power motor, inverter, gasoline engine, and a generator. In conventional hybrid systems, the wheels are driven by an electric motor and a gasoline engine. However, in the e-POWER system, the wheels are driven by a high-output electric motor like an EV.
Since the engine connected to the generator only charges the battery and does not directly drive the wheels, it is possible to freely set the start timing and efficient RPM. Generated electricity charges the high-voltage battery and directly drives the motor.
The second-generation e-POWER system delivers an attractive experience over a wide range of vehicles from compact cars to minivans and SUVs with a compact and high-output integrated inverter and motor and optimal engine combinations.
The e-POWER system in compact cars is in a compact engine room with a 1.2L engine. Despite the low-displacement engine, this system realizes motor-driven performance that generates high torque from when it starts and beyond-class powerful, smooth acceleration.
For minivans, Nissan developed a dedicated e-POWER engine that realizes EV-like driving even with a heavy vehicle body. By using a dedicated e-POWER engine, it is possible to have an optimal design that factors in integration and realizes high unit rigidity. Nissan curtails engine vibration through a synergy effect with a primary balancer shaft and flexible flywheel. Hence, it delivers excellent quietness even at times with high engine RPM for scenarios situations requiring large amounts of power generation, such as passing another vehicle.
For SUVs, Nissan simultaneously achieves overwhelming power and excellent quietness at a high level by combining the e-POWER system with its proprietary variable compression ratio engine (VC turbo engine). Combined use of the engine and turbocharger enables the vehicle to deliver high torque on par with a large displacement engine, despite the 1.5L, small-displacement engine that it has, by lowering the compression ratio and raising boost pressure, such as when driving at full throttle. Delivery of a high power-generation capacity at low RPM with this design provides quiet and comfortable driving in all situations.