Physics Electricity

A student examining a flashlight observes that it uses a traditional incandescent light bulb. The power rating of the bulb is 60 W and the bulb is connected to 36 V. What is the current moving through the bulb?

​ ​ (a)  

• 7 A

• 24 A

• 96 A

• 2,160 A

Which of the following must be the same for both resistors R1 and R2?

​ ​ (a)  

• Voltage

• Current

• Energy dissipated

• Power consumed

A student creates a parallel circuit that has three branches. The student places a resistor on each branch of the circuit so that each path has only one resistor. The student collected some of the electrical measurements in the circuit and recorded them below.

Based on the information above, which values should replace the A, B, and C in the Student Circuit Data table?

• A= 3 ohms

  B= 4.5 Amps

  C= 24 Volts

• A= 9 Volts

  B= 9 ohms

  C= 3 Amps

• A= 9 ohms

  B= 4.5 Amps

  C= 3 Volts

• A= 3 Volts

  B= 9 ohms

  C= 24 Amps

A student is classifying everyday substances as conductors or insulators using a simple circuit. The tested substances are connected to the circuit in the dotted box.

Based on the observations, which substance has the lowest resistance?

The current supplied by the battery for the circuit is 0.17 amps. Based on the circuit shown above, what is the potential difference across the 20.0 ohm resistor?

Mathematical Equivalence

ON

If the battery is 5.0 volts, what is the power dissipated by the circuit in the graphic shown above?

Mathematical Equivalence

ON

Silicon is a substance often used in electronic devices. Silicon has a high electrical resistance compared to metals which means that it does not release its electrons very easily. However, it does conduct electricity when the right conditions are met. These properties allow electronic devices to control the electrical current sent through silicon much easier than a typical metal substance.

The properties of silicon would cause it to best be classified as a ​ ​ (a)  

• semiconductor

• conductor

• insulator

• superconductor

Which of the following, on average, has the highest electrical resistance value?

• conductors

• insulators

• semiconductors

• superconductors

A cell phone company is trying to improve their chargers so that the battery charges faster. Based on the information above, which material would be the best to use when making the cell phone charger cable?

The newest generation of smart phone uses three different batteries connected in a series simultaneously to extend battery life and generate the energy necessary to power the device. If each battery is rated at 2.4 V, what is the overall voltage provided to the phone?

Mathematical Equivalence

ON