the reference directions and results are as shown in the circuit. someone changes the reference direction of current to opposite one , then what are the results for voltage and current.
calculate the power for element b shown in circuit as figure1, and determine it is source or sink.
the equivalent resistance of the circuit in figure is（ ）
as the figure, the relation between the current i1 and i2 is ( )
find the current i as shown in the circuit.
find r in the circuit if v2 =8v.
find the current i shown in circuit.
the resistances are given, also a current as shown figure, use ohm’s law, kvl and kcl to find the voltage source vx.
find the current i1 and i2 in the circuit.
find the equivalent resistance for the circuit as figure
1．in the circuit shown in figure, the current is is______
in the circuit shown in figure, the current i is______
in the stabilized circuit shown in figure, the voltage u cross the capacitor is ________
in the circuit shown in figure, the voltage u is ________
using superposition principle, when the voltage source is not active, it should be replaced by _________
using superpostion principle to find the current i1 and i2 in the circuit of figure. assuming r1=3ω, r2=1ω, r3=6ω
using source transformation to find the current through 3ωresistor in the circuit shown.
the thevenin resistance at terminals a and b is .
find: node voltages va and vb shown in figure 1. i = −2 ma; v = 3 v; r1 = 1 kω;r2 = 2 kω; r3 = 3 kω;
the unit of capacitor is
the ideal inductor acts as a circuit under steady-state dc condition.
which description fits for the law of switch.
which one is not required in finding the step response of a first-order circuit ( )
which one is not energy storage elements?
in the circuit, vs=10v, the current through inductor is ( )
determine the capacitor voltage the circuit of figure a long time after the switch has been closed.
if there is no energy stored in capacitor before switching, determine the initial current of capacitor after the switch on( )
determine the inductor initial voltage ( )
after the switch in the circuit of figure has been open for a long time, it is closed at t=0. calculate: the numerical expression for i(t) when t>0 .
there are two major sharing-bike companies in daxuecheng.
according to tommy, mobike originally focuses on the white-collar crowd.
none of the students interviewed recognized environmental contribution of sharing bike.
what does the author think can help a bank to recover from financial crisis?
what effect will climate change have?
what does the author think of the relationship between economy and nature?
what does the rainforests project aim to do?
how could rainforest nations achieve sustainable development?
students have got into the spirit, waging competitions to boost recycling and slash energy use in dorms.
they cut discarded books from bindings so the paper could be recycled.
green buildings are also cropping up on campuses, from duke with its green-roofed “smart home” to the new university of california, merced.
yet even when the basic science of climate change has been accepted by almost all scientists, many others still seem to think that it is unfounded.
this is precisely why my rainforests project has expended so much effort during these last two years to help facilitate a consensus on increasing international cooperation to cut deforestation.
if in the future it becomes clear that the world’s big polluters knew but did little or nothing about these problems, a whole new generation of resentment might be born.
the presidential candidates all tout green-collar jobs like mcanally’s as part of their plans to combat climate change.
“i can’t say for sure what kind of steak it is,” the waitress solemnly answered, “but i can assure you it was raised in a stress-free environment.”
several studies have set out how climate change will threaten economic development, especially in the most vulnerable and poorest countries.
by using innovative, long-term investment instruments, perhaps facilitated by the multilateral development banks, we could restore vast areas of already degraded land to increase food output.
cornell president believes that students have taken great initiative in earth-protecting movement.
a very famous university kalamazoo college in michigan won the nationwide recyclemania competition in 2008.
the typical feature of a green building is recyclable, reusable.
the universities offer courses and scholarships to encourage students to study the environment.
the ultimate goal of students’ doing research projects on the environment is to cultivate environmental scientists.
xiao wang is worrying about to find a job at a foreign company.
overdressed is better than underdressed when the attire is unclear in the company.
xiao wang was suggested to inform her boss whenever she was in struggle with a dilemma.
no-work related activities should be avoided in the company.
there is no word in english for working yourself to death, because____.
who work the longest time in the world?
what does prof cooper think of “working arter”?
according to derek simpson, one’s stress is mainly caused by____.
what is the result of long-hours culture in uk?
it is implied that compared with other european people, british people____.
for how many hours a week do british full-time workers work?
the student feels upset because he failed in job interview several times.
gloria failed in the interviews because she didn’t prepare well.
jordan suggests that an outline for answers would be better than writing them all out.
besides in job interview, gloria also has difficulty in study in school.
who released the report college learning for the new global century?
what type of employees do business executives find a shortage of?
what’s the negative side the previous report had?
what’s the key to continued success in the workforce according to business leaders and recent graduates?
what type of graduate will become a good investment for an employer?
what can we know about the report according to the passage?
the movie explores what a dog would like to do.
the movie “a dog’s purpose” tries to find the meaning of life through several lives of a dog.
the story of the movie teach us to love dogs.
what made jane goodall famous around the world?
what is the mission of the jane goodall institute?
what makes jane goodall an environmental activist?
why does jane goodall try to raise environmental awareness of people in developed countries?
what is most important for protecting animals and the environment?
what does jane goodall tell people to do first to protect animals and the environment?