Understanding Electric Current

This video tutorial explains the concept of current in electricity, how it is measured using an ammeter, and the conditions necessary for charge flow. It covers the differences in current behavior in series and parallel circuits and provides a formula for calculating current. The video concludes with practice questions to test understanding.

What is the unit of electric current?

• Ohms

• Watts

• Amperes

• Volts

What device is used to measure electric current?

• Voltmeter

• Ammeter

• Ohmmeter

• Wattmeter

What two conditions are necessary for electrons to flow?

• Insulation and capacitance

• Magnetic field and resistance

• Potential difference and a complete circuit

• High temperature and pressure

How does a switch control the flow of current in a circuit?

• By altering capacitance

• By changing resistance

• By creating or closing a break in the circuit

• By increasing voltage

In a series circuit, how do the readings on all ammeters compare?

• They are all different

• They are all zero

• They are all the same

• They vary with resistance

In a parallel circuit, how is the current distributed?

• Only in the main branch

• Shared between different branches

• More in the branch with higher resistance

• Equally among all branches

What is the formula for calculating current?

• Current = Power / Voltage

• Current = Charge / Time

• Current = Voltage x Resistance

• Current = Voltage / Charge

If the charge is 60 coulombs and the time is 15 seconds, what is the current?

• 6 Amps

• 4 Amps

• 8 Amps

• 2 Amps

What does the formula Q = I x T represent?

• Resistance equals voltage divided by current

• Power equals voltage times current

• Voltage equals current times resistance

• Charge equals current times time

In a series circuit with three ammeters, if A1 reads 0.5 amps, what will A2 and A3 read?

• 0.5 amps

• 2.0 amps

• 1.0 amps

• 1.5 amps