WorksheetsPretest 7: Basic Electricity
Total questions: 15
Worksheet time: 15mins
It is a difference in electric potential energy in joule/coulomb.
circuit
current
resistance
voltage
What is the SI unit of voltage?
ampere
ohm
volt
watt
It is the number of charges passing through a wire per unit time.
current
power
resistance
voltage
What is the SI unit of current?
ampere
ohm
volt
watt
It is the opposition to the flow of electric charges as they travel through a conducting wire.
circuit
current
resistance
voltage
What is the SI unit of resistance?
ampere
ohm
volt
watt
Which of the following is the correct statement of Ohm’s Law?
When current increases in a circuit, voltage increases and resistance increases.
When current increases in a circuit, voltage decreases and resistance increases.
When current increases in a circuit, voltage increases while resistance remains constant.
When current decreases in a circuit, voltage decreases and resistance increases.
It supplies energy in an electric circuit.
load
switch
voltage source
conducting wire
It converts electrical energy into different forms of energy such as light, heat, or sound in an electric circuit.
load
switch
voltage source
conducting wire
According to Ohm’s law, across a resistor with constant resistance, what happens to the current across it when the voltage applied is halved?
halved
doubled
quadrupled
remains the same
Consider a simple electric circuit with a voltage source of 20.0 V which has a current of 0.500 A. What is the resistance of the load?
20.0 ohms
30.0 ohms
40.0 ohms
50.0 ohms
A laptop power charger has an output of 5.00 volts and has a resistance of 800 ohms. What is the current output of the charger?
6.25 mA
50.0 mA
75.0 mA
80.0 mA
A LED TV power adaptor has a 2-mA output and resistance of 900 ohms. What is the voltage output of the adaptor?
2 volts
4 volts
6 volts
8 volts
A motorcycle starter motor needs 40.0 A to operate with a resistance of 0.150 ohms. What is the needed voltage to start the motor?
5.00 V
6.00 V
7.00 V
8.00 V
A water heater has a resistance of 22 Ω connected to a 220-V voltage source. What is the needed current to operate the heater?
5 A
7 A
8 A
10 A
