When two identical batteries are connected in series, the total voltage of the c

Question

When two identical batteries are connected in series, the total voltage of the combination is a. the sum of the two voltages. b. equal to the voltage of one battery. c. the reciprocal of the sum of the reciprocals of the two voltages. The electric current is a measure of the a. force exerted on the charges by the battery. b. amount of charge flowing through a wire each second. c. energy supplied by the battery each second. d. forces resisting the flow of charge through the circuit. Which of the following does NOT affect the resistance of a wire? a. current b. type of metal c. length d. temperature When resistors are connected in series, the resistances a. add. b. add as reciprocals. c. stay the same. d. are averaged. What is the resistance of a 4-Ohm resistor and a 12-Ohm resistor connected in parallel? a. 3 Ohm b. 4 Ohm c. 8 Ohm d. 12 Ohm e. 16 Ohm

Explanation / Answer

1.solution

Two Voltages in series equals the sum of the two voltages.
SO answer a is correct.

2.solution

Electric current is the flow of electric charge across a surface at the rate of one coulomb per second

so answer B is correct

3.solution

Resistance of wire defined by equation: R = *L/A

where - electrical resistivity (depend on material)

A – cross-section area of the wire (depend on diameter)

L – length of wire.

The only item not listed here is current. current value is not affect resistance (if we will not take into account any temperature changes).

so Option A is correct

4.solution

Two resistance in series equals the sum of the two resistances.
SO answer a is correct.

5.solution

when resistors are connected in parallel

total resistance is 1/Rt = 1/R1 + 1/R2

1/Rt = 1/4 + 1/12

Rt = 3 ohms

so option a is correct

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