Quiz 2: Revision on Electricity [NT Science]

What is the unit of current?

• Watt

• Ampere

• Ohm

• Volt

Answer explanation

The unit of current is ampere, with the symbol A.

What is current?

• something that opposes voltage in a circuit

• rate of flow of electrical charges

• rate of flow of voltage

• something that opposes resistance in a circuit

Convert 0.77 A into mA.

Answer explanation

1 A = 1000 mA

Hence, 0.77 A = 0.77 x 1000 mA = 770 mA

In a closed circuit, current passes from ______________.

• positive terminal to negative terminal

• negative terminal to positive terminal

• positive terminal to positive terminal

• negative terminal to negative terminal

Which device(s) is/are used to measure current?

• Multimeter

• Voltmeter

• Ammeter

• Ohmmeter

To measure the current passing through a circuit, the ammeter should be connected in ________.

What does voltage provide to an electrical circuit?

• energy needed for resistance to pass through

• energy needed for current to pass through

• resistance to oppose current

• current to oppose resistance

What is the symbol for the unit of voltage?

• W

• A

• V

• Ω

Answer explanation

The unit for voltage is the volt, represented by the symbol V.

Convert 8250 mV into V.

Answer explanation

1 V = 1000 mV

Hence, 8250 mV = 8250/1000 V = 8.25 V

Which device(s) is/are used to measure voltage?

• Multimeter

• Voltmeter

• Ammeter

• Ohmmeter