Current & Circuits

Current & Circuits

Good Things!

Get Ready for New Notes!

Multiple Choice

The SI unit in which kinetic energy is measured is 

• Newton
• Kilogram
• Joules
• Metres per second

Multiple Choice

How much kinetic energy does a person of mass 50kg running at 3m/s have? Provide your answer in KJ (kilojoules) (Divide your joules amount by 1000)

• 225 KJ

• 0.225 KJ

• 75 KJ

• 0.075 KJ

Multiple Choice

What is the kinetic energy of a 25,000g object moving at a velocity of 2.5 m/s

• 78.125 J
• 31250 J
• 781.25 J
• 78,125 J

Multiple Choice

Why voltage is important?

• Because it is the pressure that causes the electrons to move around in a circuit and make the current flow and make appliances work

• To supply energy to be able to make the current flow in electric circuit and make appliances work

• To control the resistance in the circuit

• To reduce the current in the circuit

Multiple Choice

A kettle transfers 1000J of energy every 2 seconds. Calculate its power. Remember that Watts = Joules per second.

• 2000 Watts

• 1000 Watts

• 500 Watts

• cannot be determined

Multiple Choice

A space heater transfers 500J of energy every 1 seconds. Calculate its power. Remember that Watts = Joules per second.

• 2000 Watts

• 1000 Watts

• 500 Watts

• cannot be determined

ALSO!

1 Ampere = 1 Coulomb / second

A coulomb is the unit for electric charge

Multiple Choice

A refrigerator uses a standard voltage of 120 V and has a current of about 4.2 A. What is its power rating?

(HINT: Use PVC)

• 504 Watts

• 28.6 Watts

• 0.035 Watts

• 80 Watts

Multiple Choice

The current through a resistor is 0.025 A when it is connected to a 10 V voltage source. What is the resistance?

• 0.25 ohms

• 0.0025 ohms

• 400 ohms

• 40 ohms

Multiple Choice

How many Volts would we need to produce a current flow of 8 Amps through a 6 Ohm resistor

• 12 volts
• 24 volts
• 1.3333
• 48 volts

Multiple Choice

What is the Voltage of a circuit that has a resistance of 5 Ω and a current of 2 A?

• 25 V
• 10 V
• 2.5 V
• 0.4 V

Multiple Choice

What size resistor would produce a 3 Amp current flow with a 12 Volt battery

• 1 Ohm
• 3 Ohms
• 4 Ohms
• 12 Ohms

Total Resistance

The total Resistance of a circuit (R) = R₁ + R₂ + R₃ + ... R_x

Multiple Choice

Which one is a parallel circuit?

Multiple Choice

Which one is a series circuit?