Download Test Review - Mr. Bettess` Physics 40s

Electricity/Magnetism Test Review
1.
What is the electric field strength 5 cm from a 50 µC charge?
2.
Find the electric force exerted on the particle at A.
A
6 cm
+7 C
8 cm
-9 C
+10 C
3.
How much work is done on 28 C of electrons if the potential difference is 1.5 V?
4.
A hair dryer has a power of 900 W.
a)
What is the current?
b)
How many electrons pass through the heater in 5 min?
5.
The resistance of a circuit is 6 Ω. If the potential difference is 12 V, how much energy is
used in the circuit in 10 min.?
6.
A power source in a circuit gives 120 J of potential energy to 3 C of electrons. Find
a) the voltage
b) the resistance if the current is 4 A.
7.
The number of electrons passing through a circuit in 10 minutes is 9.7 x 1022. What is the
current?
8.
What is the resistance of 50 mm of silver wire (x 10-8  m) with diameter of 10
mm?
9.
For the following circuits, find:
a)
Current through each resistor
b)
Potential difference across each resistor.
120 V
i)
2Ω
7Ω
6Ω
ii)
180 V
9Ω
10 Ω
12 Ω
216 V
1Ω
4Ω
48 Ω
3Ω
3Ω
16 Ω
3Ω
iii)
10. How much energy is stored in 8 C of electrons that are moved 1.5 cm in an electric field of
7.8 N/c