1. A parallel-plate capacitor has a plate area of 0.2 m2 and a plate separation of 0.1 mm.
Calculate the capacitance of the capacitor
2. C1 = C2 = 30 μF, and C3 = C4 = 10 μF.
Calculate the equivalent capacitance.
3. A 150 W radiant heater is constructed to operate at 115 V.
a) What is the current in the heater when the unit is operating?
b) What is the resistance of the heating coil?
c) How much thermal energy is produced in 2 h?
4. A wire 7 m long and 5 mm in diameter has a resistance of 10mΩ. A potential difference of 15 V is applied between the ends.
a) What is the resistivity of the wire?
b) What is current in the wire?
5. Calculate the equivalent resistance:
6. Choose 3 equations from the formula sheet and indicate what each one represents, then write the significance and unit of each quantity, following the example below.
p=F/A definition of pressure
p -pressure , [p]=N/m2=Pa
F-force exerted normal on the surface, [F]= N
A- area of the surface, [A]=m2
7. Draw the electrical symbol for a battery, capacitor, resistor, ammeter, and voltmeter.
8. Describe how the voltmeter is used in a circuit to measure the voltage across a resistance. You can use a sentence or you can draw a circuit.