Current, Potential Difference, Resistance

Current is measured in________

• Ohms

• Amperes

• Volts

• Joules

Define ELECTRIC CURRENT

• The ability of a material to oppose the flow of electrons

• The difference in electric potential per unit of charge measured at two different points

• The rate of electron flow past a given point in a circuit

Answer explanation

Resistance: The ability of a material to oppose the flow of electrons

Potential Difference/ Voltage: The difference in electric potential per unit of charge measured at two different points

Current: The rate of electron flow past a given point in a circuit

An ammeter must be connected in _________ with a load? (Series or Parallel)

Electric shock happens when __________ passes into the body?

• electric current

• Electric potential

• Electrical resistance

• food

Potential Difference is also known as what?

• Resistance (R)

• Voltage (V)

• Current (I)

Which 2 devices must be connected in parallel?

• Voltmeter

• Ohmmeter

• Ammeter

What device measures resistance? and how is it placed in a circuit? (Select 2)

• Ohmmeter

• Ammeter

• Series

• Parallel

Which option would INCREASE resistance in a circuit?

• Using wires that are great conductors

• Using thinner wires

• Using a shorter wire

• Keeping the wires cool

Answer explanation

Remember our straw analogy.

A thinner wire resists the flow of electric current, just like a thin straw would resist the flow of a milkshake.

What is the circuit diagram symbol for a resistor?

• 
• 
• 
• 

Answer explanation

Also shown: Ammeter, Voltmeter, Ohmmeter

What is the symbol for current?

• R 

• V

• A

• I

Answer explanation

Remember "I" is the symbol for electric current. Current is measured in Amperes (A)

e.g. I = 2.5A