NSD 61 9 Science Unit D Electricity PAT PREP

Which of the following changes to the cell shown above would result in voltage being produced?

• Reversing the leads on the voltmeter

• Using a greater volume of sulfuric acid

• Replacing 5% sulfuric acid with 20% sulfuric acid

• Changing one of the electrodes to a zinc electrode

The energy transformation that occurs in the circuit above when the switch is closed is

• chemical energy → electrical energy → light and thermal energy

• light energy → electrical energy → chemical and thermal energy

• thermal energy → chemical energy → electrical and light energy

• chemical energy → thermal energy → electrical and light energy

When a switch, a variable resistor, a light bulb, and a motor are connected the circuit will operate as follows:see diagram.

• The switch will control both the motor and the light bulb.

• The user will be able to control the brightness of the light bulb.

Which of the following matches the electrical components to their corresponding locations in the circuit described above?

• (W) =variable resistor (X)= Light Bulb (Y)= Switch (Z)= Motor

• (W)= variable resistor -(X)= Motor (Y)= Switch -(Z)= Light Bulb

• (W)= Switch (X)= Light Bulb (Y)= Variable Resistor (Z)= Motor

• (W)= Switch-(X)= Motor(Y)= Variable Resistor (Z)= Light Bulb

Jake needs to repair a car stereo system. The system contains a stereo and a fuse that are connected in series and two speakers that are connected in parallel.

Which of the following diagrams represents the car stereo system described above?

• 
• 
• 
• 

A Grade 9 student used an ammeter to measure the current of a circuit consisting of a bulb, an ammeter, and a variety of voltages. Based on the information on the graph and table if a 10.5 V battery were used, then the expected ammeter reading would be

• 4.6 mA

• 5.1 mA

• 5.6 mA

• 6.6 mA

A student is testing the conductivity of 4 different substances. He uses a 2.5 V battery and records the current in the circuit in each of the 4 substances. The chart below indicates the current measured.

Which substance is most likely an insulator?

• Substance Q

• Substance R

• Substance S

• Substance T

Calculate power for the device given above. Hint (P =I x V) I= amperage

• 16 W

• 25 W

• 100 w

• 400 W

The most efficient system shown has an efficiency of ________%.

Which of the following actions will not reduce waste of energy in a home?

• Replacing single-pane windows with double-pane windows

• Installing a programmable thermostat to control a furnace

• Wrapping an insulating blanket around a hot water tank

• Installing an air conditioner to reduce temperatures

Which of the following two methods of power generation provide the least consistent energy?

• Wind and solar power

• Hydro and wind power

• Nuclear and solar power

• Hydro and nuclear power