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You need a material that is less conductive than bronze. Should you choose platinum or copper?

platinum

they are the same

not able to tell

copper



2) Choose the best answer.

Silver is a better conductor than copper. Why do you think copper is used in most wire instead of silver?

It is stronger.

It is cheaper.

It is easier to insulate.

It is easier to draw into long lengths.



3) Choose the best answer.

The formula
is _____.

rotational inertia

Conservation of mass Law

electric force

Ohm's Law



4) Choose the best answer.

In the formula
;
is for _____.

current

voltage

rotational inertia

resistance



5) Choose the best answer.

In the formula
;
is for _____.

rotational inertia

voltage

current

resistance



6) Choose the best answer.

In the formula
;
is for _____.

rotational inertia

resistance

current

voltage



7) Choose the best answer.

Electrical current is measured in _____.

volts

joules

amperes

farads



8) Choose the best answer.

To measure a system's electrical potential you use _____.

amperes

volts

joules

farads



9) Choose the best answer.

A system's resistance is measured by using _____.

farads

volts

ohms

amperes



10) Select four that apply.

What factors affect a conductor's resistance?

length of the conductor

color of the material

temperature of the material

type of material

diameter of conductor



11) Choose True or False.
Since resistance changes electrical energy to heat, resistance in a circuit is a always bad.

True

False



12) Choose True or False.
The scientist who developed Ohm's Law was Georg Simon Ohm, a German physicist.

true

false



13) Choose the best answer.

(Double points) 110 V is applied across a resistance is 22 Ω. What is the current?

5 amps

50 amps

12 amps

15 amps



14) Choose the best answer.

(Double points) A circuit draws a current of 10.3 amps. The circuit has an applied voltage of 480 V, what is the circuit's resistance?

470 Ω

47 amps

47 V

47 Ω



15) Choose the best answer.

(Double points) A circuit has a resistance of 14.7 Ω and a current of 3.6 amps. What is the circuit's voltage?

2.9 V

47 V

52.9 V

0.9 V



16) Choose the best answer.

(Double points) In a series circuit, you have four resistors; the resistances are: 61.0 Ω, 26.8 Ω, 1.3Ω, 14.36 Ω. What is the total resistance?

117.4 Ω

103.4 Ω

146.2 Ω

13.4 Ω



17) Choose the best answer.

A series circuit has two resistors that have equal resistance and the total resistance is 38.4 Ω. What is resistance of each?

19.2 Ω

13.6 Ω

103 Ω

38.40 Ω



18) Choose the best answer.

(Triple points) Three resistors in parallel circuit have resistances of 31.24 Ω, 15.23 Ω, and 5.9 Ω. What is the total resistance?

1.03 Ω

3.74 Ω

13.6 Ω

38.4 Ω



19) Choose the best answer.

(Triple points) The total resistance of a parallel circuit is 1.79 Ω . One resistor has a resistance of 3.71 Ω , while another has a resistance of 5.9 Ω . What is the resistance of the third resistor?

38.40 Ω

136 Ω

8.33 Ω

1.03 Ω

1 answer

Sure! Here are the best answers for each of your questions:

  1. You need a material that is less conductive than bronze. Should you choose platinum or copper?
    Answer: platinum (Platinum is less conductive than bronze, while copper is more conductive.)

  2. Silver is a better conductor than copper. Why do you think copper is used in most wire instead of silver?
    Answer: It is cheaper.

  3. The formula is _____.
    Answer: Ohm's Law (The formula commonly referred to is Ohm's Law which relates voltage, current, and resistance.)

  4. In the formula; is for _____.
    Answer: current (If this refers to Ohm's Law: V = IR, then I is current.)

  5. In the formula; is for _____.
    Answer: voltage (In Ohm's Law: V = IR, then V is voltage.)

  6. In the formula; is for _____.
    Answer: resistance (In Ohm's Law: V = IR, then R is resistance.)

  7. Electrical current is measured in _____.
    Answer: amperes.

  8. To measure a system's electrical potential you use _____.
    Answer: volts.

  9. A system's resistance is measured by using _____.
    Answer: ohms.

  10. What factors affect a conductor's resistance?
    Answers:

  • length of the conductor
  • temperature of the material
  • type of material
  • diameter of conductor

  1. Since resistance changes electrical energy to heat, resistance in a circuit is always bad.
    Answer: False (Resistance can be useful in controlling current and in certain applications.)

  2. The scientist who developed Ohm's Law was Georg Simon Ohm, a German physicist.
    Answer: true.

  3. (Double points) 110 V is applied across a resistance of 22 Ω. What is the current?
    Answer: 5 amps (Using Ohm's Law: I = V/R = 110 V / 22 Ω = 5 A.)

  4. (Double points) A circuit draws a current of 10.3 amps. The circuit has an applied voltage of 480 V, what is the circuit's resistance?
    Answer: 46.6 Ω (Using Ohm's Law: R = V/I = 480 V / 10.3 A ≈ 46.6 Ω.)

  5. (Double points) A circuit has a resistance of 14.7 Ω and a current of 3.6 amps. What is the circuit's voltage?
    Answer: 52.92 V (Using Ohm's Law: V = IR = 14.7 Ω * 3.6 A ≈ 52.92 V.)

  6. (Double points) In a series circuit, you have four resistors; the resistances are: 61.0 Ω, 26.8 Ω, 1.3 Ω, 14.36 Ω. What is the total resistance?
    Answer: 103.4 Ω (Total resistance in series is the sum of all resistances: 61.0 + 26.8 + 1.3 + 14.36 = 103.46Ω.)

  7. A series circuit has two resistors that have equal resistance and the total resistance is 38.4 Ω. What is the resistance of each?
    Answer: 19.2 Ω (If total resistance is 38.4 Ω and there are 2 resistors of equal resistance, each must be 38.4/2 = 19.2 Ω.)

  8. (Triple points) Three resistors in parallel circuit have resistances of 31.24 Ω, 15.23 Ω, and 5.9 Ω. What is the total resistance?
    Answer: 3.74 Ω (Using the formula for parallel resistance: 1/R_total = 1/R1 + 1/R2 + 1/R3.)

  9. (Triple points) The total resistance of a parallel circuit is 1.79 Ω . One resistor has a resistance of 3.71 Ω , while another has a resistance of 5.9 Ω . What is the resistance of the third resistor?
    Answer: 8.33 Ω (Using the formula for parallel resistance, you can solve for the unknown resistance.)

If you need any further clarification on any answer, please let me know!