Question

Question

2 of 20

Current is caused by

            voltage differences.

            resistance.

            capacitance.

            none of the above.

Question

3 of 20

A battery with a potential difference of V connects to a resistor, and the resulting current is measured. You remove the battery, and a new battery with a potential difference of 2V is put in its place. As a result,

            the current will double.

            the resistance will double.

            both the current and the resistance will double.

            battery replacement will have no effect on the circuit.

Question

4 of 20

The definition of current is the

            potential difference across an electrical component.

            flow rate of charge through some point.

            speed of charge through some point.

            rate of energy dissipation by a resistor.

Question

5 of 20

Which device would cost more to run continuously for 1 hr?

            100 W light bulb

            A clock radio with an total resistance of 200 Ω that operates with a 120 V potential difference

            A hand mixer with a total resistance of 120 Ω that draws 1 A of current

            A television that uses a 120 V potential difference to draw 1.25 A of current

 

Answer 1

 

2. option a) voltage difference

explanation : due to voltage difference an electric field is generated inside wire which exert force on electron causing a flow of electrons in particular direction . this flow will generate current .

3.correct option a) current will double

resistance of a material/wire depends upon geometry and property of material and not on the voltage and current. as there is no change in dimension of wire so resistance will remain same.

by ohm's law V=I*R

2V =i *R

2*I*R =i*R

i= 2*I

4. correct option b) flow rate of charge

current = charge/time= rate of flow of charge

5. correct option d)