Complete Quiz

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Quiz Review

1) Open Circuit

d) A circuit with the switch turned to off or a circuit with any break

A circuit (a circle) must be complete for the switch to be “on” if there is any break or open spot, it is an “open circuit”.

2) Closed Circuit

f) A circuit with the switched turned on, or a completed circuit.

A circuit (a circle) must be complete for the switch to be “on” if there are no breaks, it is a closed circle, or “closed circuit”

3) Battery

a) A device using chemical energy to push current in a circuit.

A battery acts as a pump to push electrons through a circuit. In the last unit, we learned that a battery is a source of potential (stored) electrical enerergy.

4) Resistance

e) The ability to resist current flow.

This is a property of materials that resists current flow, much like a kink in a hose or a bottle neck resists the flow of water. A resistor reduces the pressure (voltage) of the water flowing through it.

5) Resistor

h) In a circuit diagram, an object that uses electrical energy is usually represented by one of these.

Any object, a bulb, a toaster, a piece of electronics can be a resistor.

6) Ohm’s Law

c) The mathematical relationship between current, voltage and resistance.

Ohm’s law is represented by the equation: V = I x R, or I=V/R, or R = V/I

7) Conductor

g) An object through which electricity passes easily

Any passage of electricity is said to be conduction. If it is easy, then the object or material is a conductor.

8) Insulator

b) An object that conducts electricity poorly

Any passage of electricity is said to be conduction. If it does NOT conduct electricity easily, then it is an INSULATOR.

Question 9

• A microwave uses a current of 4 amps to heat Mr. Franz’s coffee, The voltage in the wall outlet is 120 volts. Calculate the resistance of the microwave.

• Look at what we want, R• R= V/I• R=120 V / 4 A• R=30 (ohms)

Question 10

• A light bulb needs 2 amps to produce light. If the resistance of the bulb is 3 ohms, how many 1.5 volt batteries do you need to make it light?

• Look at what we want, V• V=I x R• V = 2A x 3 • V = 6 V• If each battery is 1.5 V, then we need 4 of them

Question 11/12• The diagram below pictures three identical

light bulbs, each with a resistance of 1 ohm, which are connected by resistance-free wires. A 9-volt battery supplies energy to the circuit.

• The total resistance for the circuit shown in the figure is:

• Look at what we want, R• For a series circuit, we just add the resistance• RT = R1+R2+R3 = 1 +1 +1 = 3

Question 13/14

• The current for the circuit shown is:

• The voltage drop across each light bulb above is ____ volt(s).

Question 15

• Suppose you connect more and more light bulbs in series to a battery. What happens to the brightness of each bulb as you add more bulbs?

Question 16

• The current in a series circuit:

Question 17

• The current in a series circuit ( is always the same / may be different ) in different parts of the circuit.

Question 18

• The voltage in a series circuit ( is always the same / may be different ) in different parts of the circuit.

Question 19

• The current in a parallel circuit ( is always the same / may be different ) in different branches of the circuit.

Question 20

• The voltage in a parallel circuit ( is always the same / may be different ) in different branches of the circuit.

Question 21

If each resistor is 2-ohms, what is the voltage drop across each resistor in the diagram below:

What are we looking for?

Question 22• The voltage drop across each resistor in the

circuit below is ____ volt(s).

What are we looking for?

Question 23• The current in each resistor in the circuit is

____ ampere(s). The total current is ____ amps.

What are we looking for? I = V/RThis is a parallel circuit, so V is the same

everywhere.

Question 24What is the voltage drop across each resistor?

What are we looking for? VThis is a parallel circuit, so V is the same

everywhere.