# Electricity Practice Problems

1. Ð
2. Z
1. I = R/V
2. R= P/V
3. I= P/V
4. I = V/R
1. .045 C
2. 4.0 C
3. 5.0 C
4. 6.24 C
##### 4. To increase the brightness of a desk lamp a student replaces a 50 W light bulb with a 100 W light bulb. Compared to the 60 W light bulb the 100 W light bulb has?
1. Less resistance and draws more current
2. Less resistance and draws less current
3. More resistance and draws more current
4. More resistance and draws less current
1. 10 A
2. 15 A
3. 20 A
4. 25 A
1. .01 eV
2. 1.0 eV
3. 2.0 eV
4. 3.0 eV
##### 7. A high resistance is connected in series with the internal coil of a galvanometer to make?
1. An ammeter
2. A motor
3. A generator
4. A voltmeter
##### 8. In a transformer, two coils are wound around a common iron core. To operate properly the transformer requires
1. More turns in the secondary coil than in the primary coil
2. More turns in the primary coil than in the secondary coil
3. A direct current source connecting to the secondary coil
4. An alternating current source connecting to the primary coil
##### 9. Which device can be used to increase voltage from a source of direct current?
1. Generator
2. Electroscope
3. Induction coil
4. Mass spectrometer
1. 603
2. 900
3. 15,000
4. 32,400
1. 2.1 x 10
2. 2.7 x 10
3. 3.6 x 10
4. 4.1 x 105 W
1. 1.0 V
2. 2.0 V
3. 3.0 V
4. 4.0 V
1. 5W
2. 7W
3. 10W
4. 15W
1. L/A
2. A/L
3. L + A
4. L x A
1. 1.3 x 1018
2. 2.0 x 1018
3. 1.3 x 1019
4. 2.0 x 1019