Part Six - Voltage, Current and Resistance Flashcards
A point in the electric field of two opposite charges, d1=300 cm, d2=400 cm. Q1=4 nC and Q2=-3 nC. Find the Electric Field strength.
1.748 N/C
Electrons, when flowing in a circuit, move from the ________ terminal to the _________ terminal.
Negative; Positive
In a circuit, if resistance increases, what happens to current?
It decreases
If energy cannot be created or destroyed, then when we talk about energy consumption, what are we really talking about?
Energy from electricity is transferred or converted to a new form of energy like light or sound or heat.
What does it mean for something to be a “good conductor” of electricity?
Electrons/electricity do move through the material easily.
What does it mean for something to be a “good insulator” of electricity?
Electrons/electricity don’t move through the material easily.
Which of the following materials are good conductors of electricity?
Copper, silver, metals or water
Which of the following materials are bad conductors (insulators) of electricity?
Glass, wood, rubber or plastic
A voltmeter reading across a component in a circuit that has a resistance of 2 Ω is 6 V. What is the current?
3 A
You have a resistor with a current of 0.01 A, and 5 V across. What will the current be if the voltage across is 7.5 V?
0.015 A
A circuit has an ammeter reading of 10 A, and total resistance of 20 Ω, what is the voltage of the power supply?
200 V
A circuit’s power supply has 180 V, and the ammeter reading for the circuit is 60 A, what is the circuit’s resistance?
3 Ω
A voltage of 120 V is applied to a 60 W light bulb. How much current is in the bulb?
0.5 A
A light bulb has 0.25 A of current using a voltage of 120 V. What is the power rating for this bulb?
30 W
What is the resistance of an object if a voltage of 20 V produces a current of 5 A?
4 Ω
