Pretest grade 9 current experiments

Ohm’s law states the relationship between__________.

• Electric current and heat produced in it.

• Electric power and work done.

• Electric current and potential difference.

• Electric current and electric force.

The correct relation in Ohm's law is_______.

• R = I/V

• I = VR

• I = V/R

• R = VI

An instrument to use to measure potential difference across a component is_______.

• Ammeter

• Voltmeter

• Ohmmeter

• Thermometer

Which one is a switch?

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• 
• 
• 

Which one is a resistor?

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• 
• 
• 

Which quantity is not measured by this device?

• Voltage

• Resistance

• Current

• Electric charge

What is the reading of the following ammeter?

• 0.40 A

• 0.50 A

• 0.75 A

• 1.00 A

Which one is a parallel circuit?

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• 

What will happen if bulb B is broken?

• A and C will still shine

• only A will shine

• only C will shine

• no bulb will shine

Which of the following is a safe practice when dealing with electrical appliances?

• Plugging multiple extension cords into one another

• Using electrical appliances with wet hands

• Pulling the plug from the socket by yanking the cord

• Unplugging an appliance by gripping the plug, not the cord