Electrical equipment in an office takes a current of 13 A from a 240 V supply. Estimate the cost per week of electricity if the equipment is used for 30 hours each
week and 1 kWh of energy costs Rm0.50

The cost per week of electricity is Rm 46.8

Explanation:

Electrical Power and Energy

The electrical power consumed by an appliance connected to a voltage V and carrying a current I is given by:

P = V.I

The energy consumed by an electrical appliance of power P during a time t is:

E = P.t

The electrical equipment in an office takes I=13 A when connected to a V=240 V supply.

The power consumed is:

P = 240 V * 13 A

P = 3,120 Watt

Converting to Kilowatt:

P = 3,120/1,000 KW

P = 3,12 KW

If the equipment is used t=30 hours each week, the energy is:

E = 3.12 KW * 30 h

E = 93.6 KWh

Since the cost of each KWh is Rm 0.50, the weekly cost of electricity is:

C = 93.6 * 0.50 = 46.8

The cost per week of electricity is Rm 46.8

The correct answer is D. In writing the Letter from Birmingham Jail, King sought to respond to the criticism he received from people that he considered be colleagues by methodically addressing each of their claims for Americans

Explanation:

The Letter from Birmingham Jail was an open letter written on April 16, 1963 by Martin Luther King, Jr., one of the leaders of the Civil Rights Movement in the United States. King wrote the letter from the prison in the city of Birmingham, Alabama, where he was being held after a non-violent protest against racial segregation. The letter was a response to a statement issued by eight white clergy members of Alabama on April 12, 1963 entitled "A Call to Unity." In it, they declared the existence of social injustices but expressed the belief that the battle against racial segregation should be carried out only in the courts and not carried to the streets. King responded that without strong direct action, true civil rights could never be achieved. He stated not only that civil disobedience was justified in the face of unjust laws, but that "one has the moral responsibility to disobey unjust laws."